Column I Column II ( i ) Interference ( P ) Coherent sources ( ii ) Brewster's Law ( Q ) μ = 1 sinC ( iii ) Malus Law ( R ) μ = tanθ p ( iv ) Total Internal reflection ( S ) I = I 0 cos 2 θ

i → P , ii → R , iii → S , iv → Q

i → Q , ii → S , iii → R , iv → P

i → P , ii → S , iii → R , iv → Q

i → R , ii → Q , iii → S , iv → P

EASY

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When unpolarized light is incident at an angle of $60 °$ on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

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Important Questions on Wave Optics

EASY

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

Unpolarised red light is incident on the surface of a lake at incident angle $θ_{R}$ . An observer seeing the light reflected from the water surface through a polariser notices that on rotating the polariser, the intensity of light drops to zero at a certain orientation. The red light is replaced by unpolarised blue light. The observer sees the same effect with reflected blue light at incident angle $θ_{B}$ .

Then,

EASY

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

A ray of light travelling in impure water is incident on a glass plate immersed in it. When the angle of incidence is

51 °,

the reflected ray is totally plane polarized. Given that refractive index of impure water is

1.4 .

The refractive index of glass should be _____

(\tan 51 ° = 1.235)

EASY

Physics>Optics>Wave Optics>Polarisation

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

Question Image

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Physics>Optics>Wave Optics>Polarisation

	Column I		Column II
$(i)$	Interference	$(P)$	Coherent sources
$(ii)$	Brewster's Law	$(Q)$	$μ = \frac{1}{sinC}$
$(iii)$	Malus Law	$(R)$	$μ = {tanθ}_{p}$
$(iv)$	Total Internal reflection	$(S)$	$I = I_{0} \cos^{2} θ$

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

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Physics>Optics>Wave Optics>Polarisation

Show using a proper diagram how unpolarized light can be linearly polarised by reflection from a transparent glass surface.

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Physics>Optics>Wave Optics>Polarisation

The Brewsters angle

i_{b}

for an interface should be

MEDIUM

Physics>Optics>Wave Optics>Polarisation

A ray of unpolarised light is incident on the glass surface of refractive index

1.73

at polarizing angle. The angle of refraction will be [Take

\tan 60 ° = 1.73

]

EASY

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

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

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

EASY

Physics>Optics>Wave Optics>Polarisation

An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as

100

Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by

30 °

in clockwise direction, the intensity of emerging light will be _______Lumens.

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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}

EASY

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

:

EASY

Physics>Optics>Wave Optics>Polarisation

Ordinary (i.e. unpolarised) light is incident on the surface of a transparent material at the polarising angle. If it is partly reflected and partly refracted, what is the angle between the reflected and the refracted rays ?

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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

HARD

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

MEDIUM

Physics>Optics>Wave Optics>Polarisation

Unpolarized light of intensity

I_{0}

is incident on surface of a block of glass at Brewster's angle. In that case, which one of the following statements is true?

When unpolarized light is incident at an angle of 60° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

Important Questions on Wave Optics

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When unpolarized light is incident at an angle of $60 °$ on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is