EASY

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Two rays of light $A$ and $B$ are falling on a glass slab at the angles of incidence $45 °$ and $60 °$ . If the reflected ray of $A$ is partially polarized and that of $B$ is completely polarized, then the refractive index of glass is

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Important Questions on Wave Optics

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

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

EASY

Physics>Optics>Wave Optics>Polarisation

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.

MEDIUM

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

Which of the following phenomena shows that light is a transverse wave?

MEDIUM

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

Which type of waves shows the property of polarisation?

MEDIUM

Physics>Optics>Wave Optics>Polarisation

Two circular linear polarisers are placed coaxially. The transmission axis of the first polariser is

30 °

from the vertical while the second one is at

60 °

, both in the clockwise sense. If an unpolarised beam of light of intensity,

I = 20 W m^{- 2}

is incident on this pair of polarisers, then the intensities

I_{1}

and

I_{2}

transmitted by the first and the second polarisers, respectively, will be close to,

MEDIUM

Physics>Optics>Wave Optics>Polarisation

What is polarization of light? State and explain Brewster's law.

EASY

Physics>Optics>Wave Optics>Polarisation

What is the difference between polarised and unpolarized light? Name any two methods to produce plane-polarised light.

MEDIUM

Physics>Optics>Wave Optics>Polarisation

A beam of unpolarised light of intensity

I_{0}

is passed through a polaroid

A

and then through another polaroid

B

which is oriented so that its principle plane makes an angle of

45^{o}

relative to that of

A

. The intensity of the emergent light is:

EASY

Physics>Optics>Wave Optics>Polarisation

Which waves between heat waves and sound waves can be polarised?

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?

EASY

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?

EASY

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 :

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)

MEDIUM

Physics>Optics>Wave Optics>Polarisation

θ

is the polarising angle for two optical media whose critical angles are

C_{1}

and

C_{2}

, then the correct relation is

EASY

Physics>Optics>Wave Optics>Polarisation

What is a polaroid ? Write any two applications.

MEDIUM

Physics>Optics>Wave Optics>Polarisation

What is an unpolarized light? Explain with the help of a suitable diagram how an unpolarized light can be polarized by reflection from a transparent medium. Write the expression for Brewster's angle in terms of refractive index of denser medium.

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}

Two rays of light A and B are falling on a glass slab at the angles of incidence 45° and 60°. If the reflected ray of A is partially polarized and that of B is completely polarized, then the refractive index of glass is

Important Questions on Wave Optics

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Two rays of light $A$ and $B$ are falling on a glass slab at the angles of incidence $45 °$ and $60 °$ . If the reflected ray of $A$ is partially polarized and that of $B$ is completely polarized, then the refractive index of glass is