Home
Class 12
PHYSICS
Consider a light beam incident from air ...

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in figure.
A polaroid is placed in the path of the emergent ray at point P and rotated about an axis passing through the centre and pependicular to the plane of the plaroid.

A

For a paricular orientation there shall be darkness as observed through the polaroid.

B

The intensity of light as seen through the polaroid shall be independent of the rotation.

C

The intensity of light as seen through the polaroid shall go through a minimum but not zero for two orientations of the polaroid.

D

The intensity of light as seen through the polaroid shall go through a minimum for four orientations of the polaroid.

Text Solution

Verified by Experts

The correct Answer is:
C
According to Brewster's law , the light reflected from the top of glass slab gets polarised as shown in figure. The light refractd into the glass slab and the light emerging from the glass slab is only partially polarised.

Therefore, when a polaroid is held emergent light at P, and rotated about an axis passing through the centre and perpendicular to plane of polaroid, the intensity of light shall go through a minimum but not zero for two orientations of the polaroid.
Promotional Banner

Topper's Solved these Questions

  • WAVE OPTICS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

  • WAVE OPTICS

    NCERT FINGERTIPS|Exercise Higher Order Thinking Skills|8 Videos

  • SEMICONDUCTOR ELECTRONICS : MATERIALS , DEVICES AND SIMPLE CIRCUITS

    NCERT FINGERTIPS|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

Consider a light beam incident from air to a glass slab at Brewster's angle as shown in Figure. A polaroid is placed in the path of the emergent ray at point P and rotated an axis passing through the centre and perpendicular to the plane of the polaroid.

White light is incident on the interface of glass and air as shown in figure. If green ligth is just totally internally reflected then the emerging ray in air contains

A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is.

A plane mirror, reflecting a ray of incident light, is rotated through an angle theta about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then

A light ray is incident on a plane glass slab of thickness ‘t’ at an angle of incidence ‘i’ as shown in the figure. If mu is the refractive index of glass. Then find time taken by the light ray to travel through the slab.

A plane mirror reflecting a ray of incident light is rotated through an angle of 30^@ about an axis through the point of incidence in the plane of the mirror and perpendicular to the plane of incidence then

A ray of light is incident on a parallel-sided glass slab as shown in the figure. The angle of refraction for this ray of light is likely to be :

A ray of light AO in vacuum is incident on a glass slab at angle 60^(@) and refracted at angle 30^(@) along OB as shown in the figure.The optical path length of light ray from A to B is