Ray Optics Test

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Ray Optics Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Magnification for spherical mirrors m is given by

A
− (u/v)

B
v/u

C
u/v

D
− (v/u)

Solution

m = -(v/u)
m = - image distance/object distance
Question 2
1 / -0

Total internal reflection can take place only if light is travelling from

A
Denser to rarer medium

B
No two media

C
Any two media

D
Rarer to denser medium
Solution
1. Light should travel from denser medium to rarer medium
2. Angle of incidence > critical angle.
Question 3
1 / -0

Thin lens approximation for a lens is

A
(1/v) + (1/u) = 1f

B
(1/v) − (1/u) = −(1/f)

C
(1/v) − (1/u) = 1/f

D
(1/v) + (1/u) = −(1/f)

Solution

For thin lens, lens equation is given by (1/v) − (1/u) = 1/f
Question 4
1 / -0

According to Snell’s law

A
The ratio of the sine of the angle of incidence to the sine of angle of refraction is constant

B
The ratio of the angle of incidence to the angle of refraction is constant

C
The ratio of the cosine of the angle of incidence to the cosine of angle of refraction is constant

D
The ratio of the tangent of the angle of incidence to the tangent of angle of refraction is constant

Solution

The ratio of sine of angle of incidence and sine of angle of refraction is constant for a given pair of media for a given wavelength of light.
Question 5
1 / -0

Refraction is

A
Reversal of direction of propagation of light

B
The change in frequency of light

C
None of these

D
Change of direction of propagation of light at the interface of two media as light passes from one medium to another

Solution

Refraction is a phenomenon that often occurs when light travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media, velocity of light is altered, usually causing a change in direction.