Wave Optics Test

Result

Wave Optics Test - 42

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Weekly Quiz Competition

Question 1
4 / -1

A polarizer is used to

A
Reduce intensity of light

B
Produce polarised light

C
Increase intensity of light

D
Produce unpolarized light
Question 2
4 / -1

Through which character we can distinguish the light waves from sound waves

A
Interference

B
Refraction

C
Polarisation

D
Reflection
Question 3
4 / -1

The angle of polarisation for any medium is 60°, what will be critical angle for this?

A

B

C

D

Solution
Question 4
4 / -1

The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index n) is

A

B

C

D

Solution
Question 5
4 / -1

A polaroid is placed at 45° to an incoming light of intensity I₀ . Now the intensity of light passing through polaroid after polarisation would be

A
I₀

B
I₀ / 2

C
I₀ / 4

D
Zero

Solution
Question 6
4 / -1

Plane polarised light is passed through a polaroid. On viewing through the polaroid we find that when the polaroid is given one complete rotation about the direction of the light, one of the following is observed

A
The intensity of light gradually decreases to zero and remains at zero

B
The intensity of light gradually increases to a maximum and remains at maximum

C
There is no change in intensity

D
The intensity of light is twice maximum and twice zero
Question 7
4 / -1

Out of the following statements which is not correct?

A
When unpolarised light passes through a Nicol prism, the emergent light is elliptically polarised

B
Nicol prism works on the principle of double refraction and total internal reflection

C
Nicol prism can be used to produce and analyse polarised light

D
Calcite and Quartz are both doubly refracting crystals
Question 8
4 / -1

A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster\'s angle ϕ. If µ represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is

A
90 + ϕ

B
sin^–1(µ cos ϕ)

C
90°

D
90° – sin^–1 (sin ϕ / µ)
Question 9
4 / -1

Figure represents a glass plate vertically on a horizontal table with a beam of unpolarised light falling on its surface at the polarising angle of 57° with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a

A
Vertical plane

B
Horizontal plane

C
Plane making an angle of 45° with the vertical

D
Plane making an angle of 57° with the horizontal

Solution
Question 10
4 / -1

A beam of light AO is incident on a glass slab (µ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism. On viewing through a Nicole prism, we find on rotating the prism that

A
The intensity is reduced down to zero and remains zero

B
The intensity reduces down some what and rises again

C
There is no change in intensity

D
The intensity gradually reduces to zero and then again increases