CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
Does diffuse reflection obey the law of reflection locally?
A. Only for red light
B. Only in vacuum
C. Yes
D. No, never
Correct Answer: C
Each microscopic surface patch obeys the law of reflection even though the overall pattern is diffuse.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
What is diffuse reflection?
A. Refraction through glass
B. Total absence of reflection
C. Only reflection from mirrors
D. Scattering of reflected light in many directions from a rough surface
Correct Answer: D
Microscopic surface irregularities redirect incident rays in different directions.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
What is regular reflection?
A. No reflection
B. Reflection from a smooth surface producing parallel reflected rays from parallel incident rays
C. Scattering in all directions
D. Reflection only from rough surfaces
Correct Answer: B
Smooth surfaces preserve ray order and can form clear images.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
From what line are angles of incidence and reflection measured?
A. The normal to the surface
B. The surface itself only
C. The light source
D. The horizon
Correct Answer: A
Optics convention measures these angles relative to the normal.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
What is the law of reflection?
A. Angles are always 90°
B. Angle of incidence is twice reflection
C. Reflected light has no angle
D. Angle of incidence equals angle of reflection
Correct Answer: D
Both angles are measured from the normal.
CSS - PMS - CCE - PCS - General Science
Light (Optics) - Reflection
What is reflection of light?
A. Bending of light in a new medium
B. Splitting an atom
C. Absorption only
D. Bouncing back of light from a surface
Correct Answer: D
Reflection changes light direction at a surface.