1. The bouncing back of light from a surface is called:
A) Refraction
B) Dispersion
C) Reflection
D) Diffusion
Answer: C) Reflection
2. The law of reflection states that:
A) Angle of incidence > Angle of reflection
B) Angle of reflection = Angle of incidence
C) Angle of refraction = Angle of incidence
D) Angle of reflection < Angle of incidence
Answer: B) Angle of reflection = Angle of incidence
3. The incident ray, reflected ray, and normal all lie in:
A) Different planes
B) Parallel planes
C) Same plane
D) Opposite directions
Answer: C) Same plane
4. A plane mirror always forms an image which is:
A) Real and inverted
B) Virtual and erect
C) Real and erect
D) Virtual and inverted
Answer: B) Virtual and erect
5. The image formed by a plane mirror is:
A) Larger than object
B) Smaller than object
C) Same size as object
D) Invisible
Answer: C) Same size as object
6. The bending of light when it passes from one medium to another is called:
A) Reflection
B) Refraction
C) Diffraction
D) Interference
Answer: B) Refraction
7. Refraction occurs because of change in:
A) Direction only
B) Speed of light
C) Color of light
D) Frequency of light
Answer: B) Speed of light
8. When light passes from air into glass, it bends:
A) Away from normal
B) Towards normal
C) Along the surface
D) Does not bend
Answer: B) Towards normal
9. The ratio of speed of light in vacuum to speed in a medium is called:
A) Density
B) Refractive index
C) Reflection index
D) Critical angle
Answer: B) Refractive index
10. The unit of refractive index is:
A) m/s
B) Degree
C) No unit
D) Meter
Answer: C) No unit
11. The mirror that converges parallel rays of light is:
A) Plane mirror
B) Convex mirror
C) Concave mirror
D) Transparent mirror
Answer: C) Concave mirror
12. The mirror used as rear-view mirror in vehicles is:
A) Plane mirror
B) Concave mirror
C) Convex mirror
D) Glass slab
Answer: C) Convex mirror
13. The point where parallel rays meet after reflection in concave mirror is called:
A) Pole
B) Center of curvature
C) Focus
D) Normal
Answer: C) Focus
14. Snell’s law relates:
A) Reflection and dispersion
B) Angle of incidence and angle of refraction
C) Speed and frequency
D) Mass and density
Answer: B) Angle of incidence and angle of refraction
15. If light enters from glass to air, it bends:
A) Towards normal
B) Away from normal
C) Does not bend
D) Reflects completely
Answer: B) Away from normal
16. Total internal reflection occurs when light travels from:
A) Rarer to denser medium
B) Denser to rarer medium
C) Vacuum to air
D) Air to water
Answer: B) Denser to rarer medium
17. The minimum angle of incidence for total internal reflection is called:
A) Angle of deviation
B) Angle of reflection
C) Critical angle
D) Right angle
Answer: C) Critical angle
18. Optical fibers work on the principle of:
A) Refraction
B) Dispersion
C) Total internal reflection
D) Diffusion
Answer: C) Total internal reflection
19. The lateral inversion in plane mirror means:
A) Up-down reversal
B) No change
C) Left-right reversal
D) Enlargement
Answer: C) Left-right reversal
20. A concave mirror can form a real image when the object is:
A) Between focus and pole
B) At infinity only
C) Beyond focus
D) Behind mirror
Answer: C) Beyond focus
21. The refractive index of vacuum is:
A) 0
B) 1
C) 1.5
D) 2
Answer: B) 1
22. When light passes through a rectangular glass slab, emergent ray is:
A) Deviated and parallel
B) Parallel to incident ray
C) Perpendicular
D) Reflected back
Answer: B) Parallel to incident ray
23. The normal is drawn at:
A) 45° to surface
B) 90° to surface
C) 30° to surface
D) 60° to surface
Answer: B) 90° to surface
24. Convex mirrors always form images that are:
A) Real and inverted
B) Virtual and diminished
C) Real and enlarged
D) Virtual and enlarged
Answer: B) Virtual and diminished
25. The focal length of a plane mirror is:
A) Zero
B) Infinity
C) One
D) Two
Answer: B) Infinity
26. Refraction of light in atmosphere causes:
A) Echo
B) Mirage
C) Earthquake
D) Magnetism
Answer: B) Mirage
27. The image distance in a plane mirror is:
A) Greater than object distance
B) Less than object distance
C) Equal to object distance
D) Zero
Answer: C) Equal to object distance
28. When angle of incidence is 0°, angle of reflection is:
A) 0°
B) 45°
C) 90°
D) 180°
Answer: A) 0°
29. A ray passing through the center of curvature of concave mirror is reflected:
A) Along same path
B) Towards focus
C) At 90°
D) Away randomly
Answer: A) Along same path
30. The apparent bending of a pencil in water is due to:
A) Reflection
B) Refraction
C) Diffraction
D) Polarization
Answer: B) Refraction