Question

1. If light is incident in the air medium at an angle of 30 degree, what is the angle of reflection?

a) 40 degrees

b) 20 degrees

c) 30 degrees

d) none

2. Angle of reflection does not depend upon the angle of incidence.

a) true

b) false

3. For light ray incident normally, the angle of incidence is  90 degrees.

a) true

b) false

4. Angle of refraction depends upon the angle of incidence.

a) true

b) false

5. If light is incident from water to air, the angle of refraction will be greater than the angle of incidence.

a) true

b) false

6. If light is incidence from air to water, the angle of refraction will be less than the angle of incidence.

a) true

b) false

7. The least deviated color for prism dispersion is:

a) yellow

b) red

c) orange

d) none

8. The most deviated color in prism dispersion is:

a) blue

b) none

c) red

d) green

e) orange

9. Light dispersion is produced:

a) both in a prism and in a rainbow

b) in a rainbow

c) in a mirror

d) none

e) in a prism

f) in a lens

10. A concave lens diverges a light beam but a convex lens converges a light beam.

a) true

b) false

Please provide explanations and state answer clearly. Thank you.

Answer 1

1. The angle of reflection and the angle of incidence should be equal. Or in other words, the reflected ray travels at the same angle as it incident.
The angle of reflection is 30⁰.
2. The angle of reflection depends on the angle of incidence. The angle of reflection is equal to the angle of reflection.
The comment is false. (b).
3. The angle of incidence is measured with respect to a normal to the surface. Thus a ray which incident perpendicular to the surface, the angle of incidence is zero.
The answer is (b)
4. The angle of refraction and the angle of incidence is related by the Snell's law as
n_i sin i = n_r sin r
Where i is the incident angle and r is the refracted angle.
So this is true
The answer is (a) true