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This mock test of Polarization MCQ for Physics helps you for every Physics entrance exam.
This contains 10 Multiple Choice Questions for Physics Polarization MCQ (mcq) to study with solutions a complete question bank.
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QUESTION: 1

When ordinary light is passed through rotating crystal, there is no variation in the intensity of the emergent light, this implies that

Solution:

The correct answer is: Ordinary light is symmetrical about its direction of propagation

QUESTION: 2

Find the thickness of a quater-wave plate when the wavelength of light is equal to 5890 and μ_{o} = 1.55 μ_{e }= 1.54.

The thickness of a quater-wave plate for which μ_{o }>_{ }μ_{e }(such as calcite) is given by

Solution:

Putting the given values, we get

= 1.47 x10^{-3} cm

The correct answer is: 1.47 x10^{-3} cm

QUESTION: 3

For calcite, n_{O }= 1.65836, n_{e} = 1.48641 at 18°C and for λ = 5893 . The thickness of the quarter wave plate is :

Solution:

The correct answer is: 0.857 μm

QUESTION: 4

Consider a plane electromagnetic wave that is a superposition of two independent orthogonal plane waves and can be written as the real part of

If E_{1} = E_{2}, the tip of the electric field vector will describe a trajectory that, is viewed along the z-axis from positive z and looking towards the origin, is a

Solution:

The correct answer is: A line 135°, to the positive x-axis

QUESTION: 5

Calculate the velocities of extraordinary rays in calcite crystal in a plane perpendicular to the optic axis. Given μ_{O }=_{ }1.658, μ_{e }= 1.486 and c = 3 x 10^{10 }cm/s.

Solution:

The velocity of the O-wave in the crystal is

= 1.81 x 10^{8} m/s

The velocity of the E-wave in the crystal normal to be optic axis is

= 2.02 x 10^{8 }m/s

The correct answer is: = 2.02 x 10^{8 }m/s

QUESTION: 6

If the plane wave is split & recombined on a screen after the two portions, which are polarized in the x & y directions, have travelled an optical path difference of 2π/k the observed average intensity will be proportional to :

Solution:

The correct answer is:

QUESTION: 7

Consider a plane wave that propagates through empty space are positive constants. What can you say about the polarization of this wave :

Solution:

The correct answer is: E is always parallel to the constant vector

QUESTION: 8

When scattered blue light is seen through a rotating nicol prism, a variation of intensity with zero minimum intensity is seen. What does this imply?

Solution:

The correct answer is: The scattered light is plane polarized

QUESTION: 9

A steady beam of light is normally incident on a piece of Polaroid. As the polarised is rotated around the beam axis, the transmitted intensity varies as A + Scos^{2} θ, where 6 is the angle, and A and B are constants with A > B > 0. Which of the following may be correctly concluded about the incident light?

Solution:

The correct answer is: The light is partly plane polarized and partly unpolarized

QUESTION: 10

A calcite plate 0.0031 mm thick is cut and polished such that its optic axis is parallel to the surface. A plane polarized white light from a polariser is incident normally on the plate. Estimate the phase difference if the emergent beam for wavelengths is 7068 , and μ_{O }= 1.6521 μ_{e }= 1.4811.

Solution:

For a negative uniaxial crystal like calcite ,μ_{O} > μ_{e}. Therefore, the path difference between O and E-rays for calcite plate of thickness t is, Δ = ( μ_{O}- μ_{e }) t and corresponding phase difference,

Here t= 0.00031 cm

For λ = 70684,

As the phase difference between O and E-rays is add multiple of π/2 therefore plane polarized beam is converted into elliptically polarized light in general and circularly polarized light, if the vibration in the incident plane polarised light makes an angle of 45° with the optic axis of plate.

The correct answer is: 3π/2

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