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Unpolarized light is incident on the surface of a transparent medium at such an angle of incidence that the reflected ray and the refracted ray travel at right angles to each other.

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Important Questions on Wave Optics

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A transparent medium shows relation $i$ and $r$ as shown. If the speed of light in vacuum is $c,$ the Brewster angle for the medium is

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Physics>Optics>Wave Optics>Polarisation

A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just

10 %

of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser needs to be rotated further, to reduce the output intensity to zero, is

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Physics>Optics>Wave Optics>Polarisation

Unpolarized light of intensity

I

passes through an ideal polariser

A

. Another identical polariser

B

is placed behind

A

. The intensity of light beyond B is found to be

\frac{I}{2}

. Now another identical polariser

C

is placed between

A

and

B

. The intensity beyond B is now found to be

\frac{I}{8}

. The angle between polariser

A

and

C

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Physics>Optics>Wave Optics>Polarisation

Two Polaroids

P_{1}

and

P_{2}

are placed with their axis perpendicular to each other. Unpolarised light with intensity

I_{0}

is incident on

P_{1}

. A third polaroid

P_{3}

is kept in between

P_{1}

and

P_{2}

such that its axis makes an angle

45^{o}

with that of

P_{1}

. The intensity of transmitted light through

P_{2}

EASY

Physics>Optics>Wave Optics>Polarisation

Two polarizers

A

and

B

are parallel to each other with the pass axis of

B

inclined at an angle of

30 °

to that of A. A linearly polarized light of intensity

I_{0}

, having its direction of polarization at an angle

θ

with the pass axis of

A

, is incident normally on

A

and passes through

B

. If the intensity of light transmitted through

B

\frac{3}{8} I_{0}

, the angle

θ

EASY

Physics>Optics>Wave Optics>Polarisation

A beam of light falls on a system of

4

polaroids, which are arranged in succession, such that the axis of each polaroids makes

30 °

with the axis of the preceding one. The fraction of the intensity of the incident light that passes through the system is

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Physics>Optics>Wave Optics>Polarisation

The polarising angle for transparent medium is

θ

v

is the speed of light in that medium. Then the relation between

θ

and

v

is (

c

= velocity of light in air)

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Physics>Optics>Wave Optics>Polarisation

A beam of light is incident at the polarizing angle of

35 °

on a certain glass plate. The refractive index of the glass plate is

:

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Physics>Optics>Wave Optics>Polarisation

The refractive index of a certain medium (w.r.t. air) is

n = \sqrt{3}

. Unpolarized light traveling from air to this medium is partially reflected and partially transmitted. At what angle of incidence would the reflected light be fully polarized?

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Physics>Optics>Wave Optics>Polarisation

Unpolarized light having an intensity

I_{0}

passes through a stack of

4

polarizers, the pass axis of each of the polarizer makes an angle of

30 °

with the axis of the preceding one. The intensity of light coming out of the last polarizer is

EASY

Physics>Optics>Wave Optics>Polarisation

In a stạck of three polarising sheets, the first and the third are crossed while the middle one has its axis at

45 °

to the axes of the other two. The fraction of intensity of an incident unpolarised beam of light that is transmitted by the stack is

MEDIUM

Physics>Optics>Wave Optics>Polarisation

A source of light is placed in front of a screen. The intensity of light on the screen is

I

. Two Polaroids

P_{1}

and

P_{2}

are so placed in between the source of light and screen that the intensity of light on the screen is

\frac{I}{2}

. Then the

P_{2}

, should be rotated by an angle of (degrees) so that the intensity of light on the screen becomes

\frac{3 I}{8}

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Physics>Optics>Wave Optics>Polarisation

When an unpolarized light of intensity

I_{0}

is incident on a polarizing sheet, the intensity of light which does not get transmitted is

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Physics>Optics>Wave Optics>Polarisation

Three polaroid sheets

P_{1}, P_{2}

and

P_{3}

are kept parallel to each other such that the angle between pass axes of

P_{1}

and

P_{2}

45 °

and that between

P_{2}

and

P_{3}

45 °

. If unpolarised beam of light of intensity

128 W m^{- 2}

is incident on

P_{1}

. What is the intensity of light coming out of

P_{3}

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Physics>Optics>Wave Optics>Polarisation

The refractive index

n

' and the polarizing angle '

θ_{p}

' of a medium are related as

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Physics>Optics>Wave Optics>Polarisation

A wave of frequency

= 3 GHz

, strikes a particle of size

{(\frac{1}{100})}^{t h}

λ

, then this phenomenon is called as

EASY

Physics>Optics>Wave Optics>Polarisation

If polarising angle is

α

and critical angle is

β

, then

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Physics>Optics>Wave Optics>Polarisation

Two beams, A and B of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30^o makes the two beams appear equally bright. If the initial intensities of the two beams are I_A and I_B respectively, then

\frac{I_{A}}{I_{B}}

equals :

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Physics>Optics>Wave Optics>Polarisation

Which phenomenon illustrates the nature of light waves?

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Physics>Optics>Wave Optics>Polarisation

Light waves are transverse in nature, which is due to the property of

Unpolarized light is incident on the surface of a transparent medium at such an angle of incidence that the reflected ray and the refracted ray travel at right angles to each other.

Important Questions on Wave Optics

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