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First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself.
📘 Study MCQs
Q1. What is the phenomenon of light bouncing back into the same medium when it strikes a smooth surface?
• a) Refraction
• b) Dispersion
• c) Reflection
• d) Scattering
Answer: c) Reflection
Reflection is the process where light rays, upon hitting a smooth surface like a mirror, bounce back into the original medium. This allows us to see objects in mirrors, as the light from the object reflects into our eyes.
Q2. Which type of mirror always forms a virtual, erect, and diminished image?
• a) Plane Mirror
• b) Concave Mirror
• c) Convex Mirror
• d) Cylindrical Mirror
Answer: c) Convex Mirror
A convex mirror, which curves outward, always produces a virtual, upright, and smaller image of the object, regardless of the object’s position. This is why they are used as rear-view mirrors in vehicles.
Q3. What is the name for the point where parallel rays of light meet after reflection from a concave mirror?
• a) Centre of Curvature
• b) Pole
• c) Focus
• d) Aperture
Answer: c) Focus
The focus (F) of a concave mirror is the specific point on the principal axis where all parallel rays of light converge after being reflected. The distance from the pole to this point is the focal length.
Q4. The image formed by a plane mirror is:
• a) Real and inverted
• b) Virtual and erect
• c) Real and magnified
• d) Virtual and inverted
Answer: b) Virtual and erect
A plane mirror produces an image that is virtual (cannot be projected on a screen), upright (erect), and of the same size as the object. It appears to be behind the mirror at the same distance as the object is in front.
Q5. What is the relationship between the angle of incidence and the angle of reflection?
• a) Angle of incidence is greater
• b) Angle of reflection is greater
• c) They are always equal
• d) They are always different
Answer: c) They are always equal
According to the first law of reflection, the angle of incidence is always equal to the angle of reflection. Both angles are measured from the normal, an imaginary line perpendicular to the reflecting surface at the point of incidence.
Q6. Which mirror is used by dentists to see an enlarged image of teeth?
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) Spherical Mirror
Answer: c) Concave Mirror
Dentists use a concave mirror because when an object (like a tooth) is placed between the mirror’s pole and its focus, it produces a virtual, erect, and magnified image, allowing for a clearer, enlarged view.
Q7. The spherical mirror whose reflecting surface is curved inwards is called a:
• a) Convex Mirror
• b) Plane Mirror
• c) Concave Mirror
• d) Diverging Mirror
Answer: c) Concave Mirror
A concave mirror has a reflecting surface that is curved inwards, like the inside of a spoon. It is also known as a converging mirror because it converges parallel rays of light to a single point (the focus).
Q8. Which of the following can form a real image?
• a) Plane Mirror only
• b) Convex Mirror only
• c) Concave Mirror only
• d) Both Concave and Convex Mirrors
Answer: c) Concave Mirror only
A concave mirror can form a real, inverted image when an object is placed beyond its focus. Real images can be projected onto a screen. Plane and convex mirrors always form virtual images.
Q9. The center of the spherical mirror is called the:
• a) Focus
• b) Pole
• c) Centre of Curvature
• d) Aperture
Answer: b) Pole
The pole (P) is the geometric center point of the reflecting surface of a spherical mirror. It lies on the mirror’s surface, and the principal axis is the line that passes through the pole and the centre of curvature.
Q10. The distance from the pole to the focus of a mirror is called:
• a) Radius of Curvature
• b) Focal Length
• c) Aperture
• d) Principal Axis
Answer: b) Focal Length
The focal length (f) is the distance between the pole (P) of the mirror and its principal focus (F). It is a key property that determines the mirror’s power to converge or diverge light.
Q11. For a spherical mirror, the focal length (f) is related to the radius of curvature (R) by:
• a) f = R
• b) f = R/2
• c) f = 2R
• d) f = R/4
Answer: b) f = R/2
For any spherical mirror, the focal length is exactly half of its radius of curvature. The relationship is f = R/2. The radius of curvature is the distance from the pole to the centre of curvature.
Q12. The image formed in a convex mirror is always:
• a) Real and inverted
• b) Virtual and erect
• c) Real and magnified
• d) Virtual and inverted
Answer: b) Virtual and erect
Due to its diverging nature, a convex mirror always produces an image that is virtual (behind the mirror), upright (erect), and diminished in size. This provides a wider field of view.
Q13. In a concave mirror, when an object is placed at the centre of curvature, the image formed is:
• a) Real, inverted, and same size
• b) Virtual, erect, and magnified
• c) Real, inverted, and diminished
• d) Virtual, erect, and diminished
Answer: a) Real, inverted, and same size
When an object is placed at the centre of curvature (C) of a concave mirror, the reflected rays converge to form a real and inverted image at the same point (C). This image is the same size as the object.
Q14. Which mirror is used in solar cookers to concentrate sunlight?
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) Any spherical mirror
Answer: c) Concave Mirror
Concave mirrors are used in solar cookers because they are converging mirrors. They reflect and concentrate parallel sunrays onto a single focal point, generating intense heat suitable for cooking.
Q15. The perpendicular line drawn to the reflecting surface at the point of incidence is called the:
• a) Incident ray
• b) Reflected ray
• c) Normal
• d) Principal axis
Answer: c) Normal
The normal is an imaginary line drawn perpendicular (at 90 degrees) to the reflecting surface at the exact point where the incident ray strikes. All angles are measured from this reference line.
Q16. Magnification (m) for a mirror is defined as:
• a) Size of object / Size of image
• b) Size of image / Size of object
• c) Height of mirror / Height of object
• d) Distance of object / Distance of image
Answer: b) Size of image / Size of object
Magnification (m) is the ratio of the height of the image (h’) to the height of the object (h). It tells us how much larger or smaller the image is compared to the object. m = h’/h.
Q17. If magnification (m) is positive for a mirror, the image is:
• a) Real and inverted
• b) Virtual and erect
• c) Real and erect
• d) Virtual and inverted
Answer: b) Virtual and erect
By sign convention, a positive magnification indicates that the image is virtual and erect. A negative magnification indicates a real and inverted image. The sign tells us about the nature and orientation of the image.
Q18. Which mirror can produce an image that is both real and virtual depending on object position?
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) All of the above
Answer: c) Concave Mirror
A concave mirror is versatile. When an object is beyond the focus, it forms a real image. When the object is between the focus and the pole, it forms a virtual, erect, and magnified image.
Q19. The reflecting surface of a plane mirror is:
• a) Curved inwards
• b) Curved outwards
• c) Flat
• d) Rough
Answer: c) Flat
A plane mirror has a perfectly flat and smooth reflecting surface. This allows for regular reflection, where parallel rays remain parallel after reflection, producing a clear and undistorted image.
Q20. Which law states that the incident ray, reflected ray, and normal all lie in the same plane?
• a) First law of reflection
• b) Second law of reflection
• c) Law of refraction
• d) Snell’s law
Answer: a) First law of reflection
The first law of reflection states that the incident ray, the reflected ray, and the normal to the reflecting surface at the point of incidence all lie in one plane. This defines the geometry of reflection.
Q21. A virtual image cannot be:
• a) Seen in a mirror
• b) Erect
• c) Formed by a concave mirror
• d) Obtained on a screen
Answer: d) Obtained on a screen
A virtual image is formed when light rays appear to diverge from a point but do not actually meet. Since the rays do not converge, a virtual image cannot be projected or captured on a physical screen.
Q22. The mirror used as a shaving mirror is:
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) Any of these
Answer: c) Concave Mirror
A concave mirror is used for shaving because when the face is placed between the pole and the focus of the mirror, it produces a virtual, erect, and enlarged image, making it easier to see details.
Q23. A ray of light passing through the centre of curvature of a concave mirror, after reflection, will:
• a) Pass through the focus
• b) Retrace its path
• c) Become parallel to the principal axis
• d) Go in any random direction
Answer: b) Retrace its path
A ray of light directed towards the centre of curvature of a concave mirror strikes the mirror along the normal (perpendicularly). According to the laws of reflection, it will reflect back along the same path.
Q24. An object is placed between a concave mirror and its focus. The image will be:
• a) Real and inverted
• b) Virtual and erect
• c) Real and erect
• d) Virtual and inverted
Answer: b) Virtual and erect
When an object is placed between the focus (F) and the pole (P) of a concave mirror, the reflected rays diverge. To an observer, they appear to come from behind the mirror, forming a virtual, upright, and magnified image.
Q25. For a concave mirror, if the object is at infinity, the image is formed at:
• a) Centre of Curvature
• b) Focus
• c) Between Focus and Pole
• d) Behind the mirror
Answer: b) Focus
When an object is at a very large distance (infinity), the incoming rays are parallel to the principal axis. After reflection from a concave mirror, these parallel rays converge to meet at the principal focus (F), forming a point-sized, real, and inverted image.
Q26. Which mirror is also known as a diverging mirror?
• a) Plane Mirror
• b) Concave Mirror
• c) Convex Mirror
• d) None of these
Answer: c) Convex Mirror
A convex mirror is called a diverging mirror because when parallel rays of light strike its surface, they reflect and spread out (diverge). The reflected rays appear to come from a single point behind the mirror, the focus.
Q27. The rear-view mirrors of cars are usually:
• a) Plane Mirrors
• b) Concave Mirrors
• c) Convex Mirrors
• d) Parabolic Mirrors
Answer: c) Convex Mirrors
Convex mirrors are used as rear-view mirrors because they always provide a wider field of view, allowing the driver to see more of the traffic behind. The image is diminished, giving a broader perspective.
Q28. The radius of curvature for a spherical mirror is the distance between:
• a) Pole and Focus
• b) Focus and Centre of Curvature
• c) Pole and Centre of Curvature
• d) Two ends of the mirror
Answer: c) Pole and Centre of Curvature
The radius of curvature (R) is the distance from the pole (P) of the mirror to its centre of curvature (C). It is essentially the radius of the imaginary sphere of which the mirror is a part.
Q29. The mirror formula is given by:
• a) 1/u + 1/v = 1/f
• b) uv = f
• c) u + v = f
• d) 1/f = u – v
Answer: a) 1/u + 1/v = 1/f
The mirror formula, 1/u + 1/v = 1/f, relates the object distance (u), image distance (v), and focal length (f) of a spherical mirror. It applies to both concave and convex mirrors with the appropriate sign convention.
Q30. A convex mirror forms the image of an object placed at infinity. Where is the image located?
• a) At the focus, behind the mirror
• b) At the centre of curvature
• c) At the pole
• d) Between focus and pole
Answer: a) At the focus, behind the mirror
For a convex mirror, when parallel rays from an object at infinity strike it, they reflect and diverge. These diverging rays appear to originate from the principal focus (F) located behind the mirror, forming a virtual, point-sized image at F.
Q31. The mirror which can form an image larger than the object is:
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) Both b and c
Answer: c) Concave Mirror
A concave mirror can produce a magnified (enlarged) image when the object is placed between its focus (F) and the centre of curvature (C). In this position, it forms a real, inverted, and magnified image.
Q32. If the image distance (v) is negative in the mirror formula, the image is:
• a) Real
• b) Virtual
• c) Inverted
• d) Magnified
Answer: b) Virtual
According to the sign convention for mirrors, a negative image distance (v) indicates that the image is formed behind the mirror, which means it is virtual. A positive ‘v’ indicates a real image in front of the mirror.
Q33. The phenomenon where left appears right and right appears left in a mirror is called:
• a) Inversion
• b) Lateral Inversion
• c) Reflection
• d) Magnification
Answer: b) Lateral Inversion
Lateral inversion is the effect where the left side of an object appears as the right side in its mirror image, and vice versa. This is commonly observed in plane mirrors, as seen in the word “AMBULANCE” written reversed on vehicles.
Q34. Which of the following is not a use of a convex mirror?
• a) Rear-view mirror in vehicles
• b) Security mirror in shops
• c) Shaving mirror
• d) Mirror at road bends
Answer: c) Shaving mirror
Convex mirrors are not used for shaving because they produce diminished images. Shaving requires an enlarged view, which is provided by a concave mirror. Convex mirrors are used for security and wide-angle viewing.
Q35. For a concave mirror, if the object is at the focus, the image is formed at:
• a) Focus
• b) Centre of Curvature
• c) Infinity
• d) Between Focus and Pole
Answer: c) Infinity
When an object is placed at the focus (F) of a concave mirror, the reflected rays become parallel to the principal axis. Parallel rays are said to meet at infinity, so the image is real, inverted, and highly magnified at infinity.
Q36. The image formed by a concave mirror is observed to be virtual, erect, and larger than the object. Where should the object be placed?
• a) At the focus
• b) Between focus and pole
• c) At the centre of curvature
• d) Beyond the centre of curvature
Answer: b) Between focus and pole
To get a virtual, erect, and magnified image from a concave mirror, the object must be placed between its principal focus (F) and the pole (P) of the mirror. This is the principle used in makeup and shaving mirrors.
Q37. A ray of light incident on a spherical mirror parallel to its principal axis, after reflection, will pass through:
• a) The pole for a concave mirror
• b) The focus for a concave mirror
• c) The centre of curvature for a convex mirror
• d) The pole for a convex mirror
Answer: b) The focus for a concave mirror
For a concave mirror, any incident ray parallel to the principal axis will, after reflection, pass through the principal focus (F). This is a key property used in ray diagrams for concave mirrors.
Q38. The number of images formed when two plane mirrors are placed at an angle of 90 degrees to each other is:
• a) 1
• b) 2
• c) 3
• d) Infinite
Answer: c) 3
When two plane mirrors are inclined at an angle θ, the number of images formed is given by (360/θ) – 1, if 360/θ is an integer. For θ = 90°, (360/90) – 1 = 4 – 1 = 3 images are formed.
Q39. A convex mirror is preferred over a plane mirror for use as a rear-view mirror because it:
• a) Gives a larger field of view
• b) Forms a real image
• c) Forms a magnified image
• d) Does not cause lateral inversion
Answer: a) Gives a larger field of view
A convex mirror provides a wider field of view compared to a plane mirror of the same size. This allows drivers to see more area behind the car, enhancing safety, even though the images are diminished.
Q40. If an object is moved towards a concave mirror from infinity, the size of its real image will:
• a) Decrease
• b) Increase
• c) Remain the same
• d) First increase then decrease
Answer: b) Increase
As an object is moved from infinity towards a concave mirror, its real, inverted image moves from the focus towards the centre of curvature. During this movement, the size of the image keeps increasing.
Q41. Which mirror will you use to get a beam of parallel light from a source placed at its focus?
• a) Plane Mirror
• b) Concave Mirror
• c) Convex Mirror
• d) Any of these
Answer: b) Concave Mirror
When a light source is placed at the focus of a concave mirror, the rays from the source, after reflection, become parallel to the principal axis. This principle is used in searchlights, torches, and headlights.
Q42. The focal length of a plane mirror is:
• a) Zero
• b) Infinity
• c) Equal to its radius of curvature
• d) 25 cm
Answer: b) Infinity
A plane mirror can be considered a spherical mirror with an infinitely large radius of curvature. Since focal length f = R/2, if R is infinite, f is also infinite. Parallel rays remain parallel after reflection.
Q43. A concave mirror produces a real image of an object. The image is of the same size as the object. The object is at:
• a) Focus
• b) Centre of Curvature
• c) Between Focus and Centre of Curvature
• d) Between Pole and Focus
Answer: b) Centre of Curvature
For a concave mirror, when an object is placed at the centre of curvature (C), the image is also formed at C. This image is real, inverted, and exactly the same size as the object.
Q44. A ray of light strikes a plane mirror at an angle of 30° to the normal. The angle of reflection will be:
• a) 30°
• b) 60°
• c) 90°
• d) 0°
Answer: a) 30°
According to the second law of reflection, the angle of reflection is always equal to the angle of incidence. Both are measured from the normal. So, if incidence is 30°, reflection is also 30°.
Q45. Which mirror is used in torch lights to direct light in a specific direction?
• a) Plane Mirror
• b) Convex Mirror
• c) Concave Mirror
• d) All of these
Answer: c) Concave Mirror
Torch lights use a concave mirror as a reflector. The bulb is placed at the focus of the mirror, so the light rays from the bulb, after reflection, become a strong parallel beam, providing directed illumination.
Q46. The magnification produced by a plane mirror is:
• a) Less than 1
• b) Greater than 1
• c) Equal to 1
• d) Zero
Answer: c) Equal to 1
A plane mirror forms an image that is the same size as the object. Therefore, the magnification (m = height of image/height of object) is exactly 1. The image is also virtual and erect.
Q47. The mirror that can be used to concentrate sunlight to produce heat is a:
• a) Plane mirror
• b) Convex mirror
• c) Concave mirror
• d) Any type of mirror
Answer: c) Concave mirror
Concave mirrors are converging mirrors. When sunlight, which consists of parallel rays, falls on a concave mirror, it reflects and concentrates all the energy onto its small focal area, producing intense heat used in solar devices.
Q48. An object is placed at a distance of 15 cm from a concave mirror of focal length 10 cm. The image distance will be:
• a) 30 cm
• b) 20 cm
• c) 10 cm
• d) 5 cm
Answer: a) 30 cm
Using the mirror formula: 1/f = 1/u + 1/v. Here, u = -15 cm (object distance), f = -10 cm (for concave mirror). Plugging values: 1/(-10) = 1/(-15) + 1/v. Solving gives v = -30 cm. The negative sign indicates a real image 30 cm in front.
Q49. For a convex mirror, the focal length is taken as:
• a) Positive
• b) Negative
• c) Zero
• d) Infinity
Answer: a) Positive
According to the sign convention, the focal length (f) of a convex mirror is taken as positive because its focus is a virtual point located behind the mirror. The radius of curvature is also positive for convex mirrors.
Q50. The image formed by a concave mirror is found to be highly magnified and inverted. The object is likely placed:
• a) Between pole and focus
• b) At the focus
• c) Between focus and centre of curvature
• d) At the centre of curvature
Answer: c) Between focus and centre of curvature
When an object is placed between the focus (F) and the centre of curvature (C) of a concave mirror, the image is formed beyond C. This image is real, inverted, and magnified (larger than the object).