Q1. A spherical mirror whose reflecting surface is curved inward is called
a) Convex mirror
b) Plane mirror
c) Concave mirror
d) Cylindrical mirror
Answer: Concave mirror.
Why correct: The surface bends inward.
Why others wrong: Others are different types.
Q2. A mirror which always forms a virtual, erect and diminished image is
a) Concave
b) Convex
c) Plane
d) None
Answer: Convex.
Why correct: Convex mirrors diverge light.
Why others wrong: Concave/plane can form different kinds of images.
Q3. The centre of the mirror surface is called
a) Focus
b) Centre of curvature
c) Pole
d) Radius
Answer: Pole.
Why correct: Pole is the midpoint of mirror.
Why others wrong: They represent different points.
Q4. The point where parallel rays meet after reflection is
a) Pole
b) Focus
c) Radius
d) Axis
Answer: Focus.
Why correct: Rays converge at focus.
Why others wrong: They are not convergence points.
Q5. The distance between pole and focus is called
a) Radius
b) Diameter
c) Focal length
d) Image distance
Answer: Focal length.
Why correct: Definition of focal length.
Why others wrong: Incorrect terms.
Q6. If radius of curvature is R, the focal length is
a) R
b) 2R
c) R/2
d) R/4
Answer: R/2.
Why correct: f = R/2.
Why others wrong: Wrong relations.
Q7. A real image is formed when rays
a) Appear to meet
b) Actually meet
c) Diverge
d) Scatter
Answer: Actually meet.
Why correct: Real intersection forms real image.
Why others wrong: Apparent meeting forms virtual image.
Q8. Which mirror can form real images?
a) Plane
b) Convex
c) Concave
d) All
Answer: Concave.
Why correct: It converges rays.
Why others wrong: Plane/convex give virtual images only.
Q9. The principal focus of a concave mirror is the point where
a) Parallel rays meet after reflection
b) Light stops
c) Image disappears
d) Object is placed
Answer: Parallel rays meet after reflection.
Why correct: Convergence point of parallel rays.
Why others wrong: Physically incorrect ideas.
Q10. Focal length if radius is 20 cm
a) 5
b) 10
c) 20
d) 40
Answer: 10.
Why correct: 20/2.
Why others wrong: Wrong calculation.
Q11. Pole is taken as
a) Reference mirror
b) Origin
c) Curvature
d) Infinity
Answer: Origin.
Why correct: All distances from pole.
Why others wrong: Incorrect definitions.
Q12. Principal axis is taken as
a) y-axis
b) x-axis
c) z-axis
d) Tangent
Answer: x-axis.
Why correct: Standard convention.
Why others wrong: Not conventions.
Q13. Object is placed
a) Right
b) Below
c) Left
d) Behind
Answer: Left.
Why correct: New Cartesian rule.
Why others wrong: Wrong directions.
Q14. Distances to right are
a) Negative
b) Zero
c) Positive
d) Undefined
Answer: Positive.
Why correct: +x direction.
Why others wrong: Opposite/invalid.
Q15. Distances to left are
a) Positive
b) Negative
c) Zero
d) Neutral
Answer: Negative.
Why correct: –x direction.
Why others wrong: Invalid.
Q16. Distances above axis
a) Negative
b) Positive
c) Zero
d) Ignored
Answer: Positive.
Why correct: +y direction.
Why others wrong: Invalid.
Q17. Distances below axis
a) Zero
b) Positive
c) Negative
d) Infinite
Answer: Negative.
Why correct: –y direction.
Why others wrong: Invalid.
Q18. Distance from pole to object
a) Image distance
b) Focal length
c) Object distance
d) Radius
Answer: Object distance.
Why correct: Definition.
Why others wrong: Different meanings.
Q19. Distance from pole to image
a) Object distance
b) Image distance
c) Focal length
d) Magnification
Answer: Image distance.
Why correct: Definition.
Why others wrong: Incorrect.
Q20. Distance from pole to focus
a) Radius
b) Image distance
c) Focal length
d) Diameter
Answer: Focal length.
Why correct: Definition.
Why others wrong: Incorrect.
Q21. Formula relating u, v, f
a) Lens law
b) Mirror formula
c) Newton law
d) Reflection rule
Answer: Mirror formula.
Why correct: Standard equation.
Why others wrong: Not used here.
Q22. Valid for
a) Concave only
b) Convex only
c) All spherical mirrors
d) Plane mirrors
Answer: All spherical mirrors.
Why correct: Works for concave & convex.
Why others wrong: Incomplete/wrong.
Q23. Magnification is ratio of
a) v/u
b) hi/ho
c) f/R
d) s/t
Answer: hi/ho.
Why correct: Size comparison.
Why others wrong: Not definition.
Q24. Symbol for magnification
a) h
b) f
c) m
d) v
Answer: m.
Why correct: Standard symbol.
Why others wrong: Other quantities.
Q25. Object height is taken
a) Negative
b) Zero
c) Positive
d) Infinite
Answer: Positive.
Why correct: Convention.
Why others wrong: Invalid.
Q26. Image height above axis is
a) Negative
b) Zero
c) Positive
d) Infinite
Answer: Positive.
Why correct: +y direction.
Why others wrong: Wrong signs.
Q27. Image below axis is
a) Positive
b) Negative
c) Zero
d) Undefined
Answer: Negative.
Why correct: –y direction.
Why others wrong: Wrong signs.
Q28. A concave mirror used as a shaving mirror because it forms
a) Shadow
b) Real image
c) Virtual enlarged image
d) Diminished image
Answer: Virtual enlarged image.
Why correct: Close object gives magnified image.
Why others wrong: Not suitable.
Q29. Which mirror is used in vehicles?
a) Concave
b) Convex
c) Plane
d) None
Answer: Convex.
Why correct: Wider view.
Why others wrong: Limited view.
Q30. The SI unit of focal length
a) metre
b) second
c) watt
d) newton
Answer: metre.
Why correct: Length quantity.
Why others wrong: Other units.
Q31. Large image can be obtained with
a) Convex far
b) Plane
c) Concave near focus
d) None
Answer: Concave near focus.
Why correct: High magnification.
Why others wrong: No enlargement.
Q32. Concave mirror can form
a) Only real
b) Both real & virtual
c) Only virtual
d) No image
Answer: Both real & virtual.
Why correct: Depends on position.
Why others wrong: Incomplete.
Q33. Virtual image is formed when rays
a) Meet
b) Reflect only
c) Appear to meet
d) Block
Answer: Appear to meet.
Why correct: No real intersection.
Why others wrong: Incorrect.
Q34. Which gives erect image only?
a) Convex
b) Concave
c) Plane & Convex
d) All
Answer: Plane & Convex.
Why correct: Always erect.
Why others wrong: Concave can invert.
Q35. Image cannot be obtained on screen when
a) Real
b) Virtual
c) Bright
d) Near
Answer: Virtual.
Why correct: No real intersection of rays.
Why others wrong: Irrelevant.
Q36. Which mirror is used in torches?
a) Plane
b) Convex
c) Concave
d) None
Answer: Concave.
Why correct: Forms parallel beam.
Why others wrong: Not suitable.
Q37. A plane mirror forms image that is
a) Same size
b) Enlarged
c) Inverted
d) Real
Answer: Same size.
Why correct: Unit magnification.
Why others wrong: Incorrect.
Q38. Image formed by convex mirror is always
a) Real
b) Inverted
c) Virtual & diminished
d) Same size
Answer: Virtual & diminished.
Why correct: Diverging mirror.
Why others wrong: Wrong.
Q39. For real image by concave mirror, object must be
a) Beyond focus
b) Inside focus
c) At pole
d) Anywhere
Answer: Beyond focus.
Why correct: Needed for real image.
Why others wrong: Wrong conditions.
Q40. If magnification is negative, image is
a) Erect
b) Inverted
c) Virtual
d) Enlarged
Answer: Inverted.
Why correct: Sign shows orientation.
Why others wrong: Incorrect.
Q41. If |m| > 1, image is
a) Diminished
b) Same
c) Enlarged
d) No image
Answer: Enlarged.
Why correct: Size factor.
Why others wrong: Wrong.
Q42. If |m| < 1, image is
a) Enlarged
b) Same
c) Diminished
d) Real only
Answer: Diminished.
Why correct: Reduced size.
Why others wrong: Incorrect.
Q43. Radius of curvature equals
a) 2f
b) f/2
c) f
d) 4f
Answer: 2f.
Why correct: R = 2f.
Why others wrong: Wrong relations.
Q44. Which point is twice the focal distance?
a) Focus
b) Centre of curvature
c) Pole
d) Axis
Answer: Centre of curvature.
Why correct: R = 2f.
Why others wrong: Not valid.
Q45. Rays through focus after reflection become
a) Parallel
b) Divergent
c) Random
d) Circular
Answer: Parallel.
Why correct: Reversibility of light.
Why others wrong: Incorrect behaviour.
Q46. A ray through centre of curvature reflects
a) Deviated
b) Retraces path
c) Absorbed
d) Random
Answer: Retraces path.
Why correct: Normal incidence.
Why others wrong: False.
Q47. A ray parallel to principal axis reflects
a) Back
b) Away
c) Through focus
d) Randomly
Answer: Through focus.
Why correct: Law of mirrors.
Why others wrong: Wrong.
Q48. A ray through focus reflects
a) To focus
b) Parallel
c) Away
d) Stops
Answer: Parallel.
Why correct: Reversibility.
Why others wrong: Wrong.
Q49. A ray through pole reflects
a) With equal angle
b) Back
c) Into focus
d) Random
Answer: With equal angle.
Why correct: Normal law.
Why others wrong: Incorrect.
Q50. Basic law followed by reflection
a) Snell
b) Refraction
c) Reflection law
d) Diffusion
Answer: Reflection law.
Why correct: Governs bouncing of light.
Why others wrong: Not reflection laws.