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Physics 10 Chapter 3 - Geometrical Optics - 11
1.
What is the refractive index of water?
a) 2.12
b) 1.33
c) 10.1
d) 31.0
2.
What is ‘n’ in the formula “n = c / v”?
a) Speed of light in vacuum
b) Speed of light in medium
c) Speed of light in water
d) Refractive index
3.
What is the refractive index of air?
a) 1.00
b) 10.1
c) 31.0
d) 2.12
4.
A ray of light enters from air into glass surface. The angle of incidence i is 30˚. If the refractive index of glass is 1.52, then find the angle of refraction r?
a) Angle of refraction r = 0.33˚
b) Angle of refraction r = 19.3˚
c) Angle of refraction r = 9.33˚
d) Angle of refraction r = 0.91˚
5.
When a ray of light enters from a denser medium to a rarer medium, then what happens to the ray of light?
a) It bends towards the normal
b) It bends away from the normal
c) It reflects back
d) It goes straight without any deviation
6.
What is the angle of incidence called that causes the refracted ray to bend through 90˚?
a) Reflective angle
b) Refractive angle
c) Critical angle
d) Partition angle
7.
If the entire light is reflected back from the rarer medium to the denser medium, what is this phenomena called?
a) Partitioned internal reflection
b) Partitioned internal refraction
c) Total internal reflection
d) Total internal refraction
8.
When total internal reflection occurs?
a) Angle of reflection = Critical angle
b) Angle of incidence = Angle of reflection
c) Angle of incidence = Critical angle
d) Angle of refraction = Critical angle
9.
Find the value of critical angle for water if the refracted angle is 0˚. The refractive index of water is 1.33 and that of air is 1?
a) 28.8˚
b) 38.8˚
c) 48.8˚
d) 58.8˚
10.
If a ray of light in glass is incident on an air surface at an angle greater than the critical angle, the ray will..................?
a) Diffract only
b) Reflect only
c) Partially refract and partially reflect
d) Refract only
11.
The critical angle for a beam of light passing from water into air is 48.8 degrees. This means that all light rays with an angle of incidence greater than this angle will be...............?
a) Partially reflected and partially transmitted
b) Totally transmitted
c) Totally reflected
d) Absorbed
12.
What is the transparent body called with at least two polished plane faces inclined towards each other?
a) Mirror
b) Prism
c) Lens
d) Optical fibre
13.
Prism is the transparent body from which light is...................?
a) Reflected
b) Refracted
c) Diffracted
d) Rare facted
14.
What is the angle called at which emergent ray is deviated?
a) Angle of refraction
b) Angle of incidence
c) Angle of deviation
d) Critical angle
15.
If critical angle is 48˚. Tell that at which angle of incidence, total internal reflection occurs?
a) 38˚
b) 28˚
c) 50˚
d) 58˚
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