Draw a Neat Labelled Diagram Showing the Plane of Vibration and Plane of Polarisation for Polarised Light. - Physics


Draw a neat labelled diagram showing the plane of vibration and plane of polarisation for polarised light.



Concept: Polarisation
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2013-2014 (October)



If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................

What is a Polaroid?

With the help of neat diagram, explain how non-polar dielectric material is polarised in external electric field of increasing intensity. Define polarisation in dielectrics.

For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.

If the critical angle of a medium is sin-1(3/5), find the polarising angle.

Three identical polaroid sheets P1, P2 and P3 are oriented so that the pass axis of P2 and P3 are inclined at angles of 60° and 90° respectively with the pass axis of P1. A monochromatic source S of unpolarised light of intensity I0 is kept in front of the polaroid sheet P1 as shown in the figure. Determine the intensities of light as observed by the observer at O, when polaroid P3 is rotated with respect to P2 at angles θ = 30° and 60°.

What dose a polaroid consist of?

Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?

Show, with the help of a diagram, how unpolarised sunlight gets polarised due to scattering.

Two polaroids P1 and P2 are placed with their pass axes perpendicular to each other. Unpolarised light of intensity I0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle of 60° with that of P1. Determine the intensity of light transmitted through P1, P2 and P3.

The refractive indices of glass and water w.r.t. air are 3/2 and 4/3 respectively. Determine the refractive index of glass w.r.t. water.

The refractive indices of water for red and violet colours are 1.325 and 1.334 respectively.
Find the difference between the velocities of rays for these two colours in water. (c = 3 × 108 m/s)

A ray of light passes from a vacuum to a medium of refractive index (μ). The angle of
incidence is found to be twice the angle of refraction. The angle of incidence is _______.

A) `cos^(-1)(mu/2)`

B) cos−1(μ)

C)  `2 cos^(-1) (mu/2)`

D) `2 sin^(-1) (mu/2)`

Unpolarised light is passed through a polaroid P1. When this polarised beam passes through another polaroid P2 and if the pass axis of P2 makes angle θ with the pass axis of P1, then write the expression for the polarised beam passing through P2. Draw a plot showing the variation of intensity when θ varies from 0 to 2π.

What is the value of refractive index of a medium of polarising angle 60°?

State two uses of Polaroid.

The glass plate of refractive index 1.732 is to be used as a polarizer, its polarising angle is _______.

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

With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarized?

State any two methods by which ordinary light can be polarised

What does a polaroid consist of? How does it produce a linearly polarised light?

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

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 : 

A ray of light is incident on a transparent medium at a polarizing angle. What is the angle between the reflected ray and the refracted ray?

What is the difference between polarised light and unpolarised light? 

A ray of ordinary light is travelling in air. It is incident on air glass pair at a polarising angle of 56°. Find the angle of refraction in glass.

Light transmitted by Nicol prism is ______.

What is polarisation?

Discuss polarisation by selective absorption.

What is a polariser?

What is a analyser?

What is plane polarised light?

What is partially polarised light?

List the uses of polaroids.

State Brewster’s law.

What is the angle of polarisation and obtain the equation for an angle of polarisation?

Discuss about pile of plates.

What is double refraction?

How is polarisation of light obtained by scattering of light?

What is normal focusing?

The reflected light is found to be plane polarised when an unpolarized light falls on a denser medium at 60° with the normal. Find the angle of refraction and critical angle of incidence for total internal reflection in the denser to rarer medium reflection.

A plane mirror produces a magnification of

Polarisation of light is the only phenomenon that establishes ______.

Which of the following phenomena is not common to sound and light waves?

Figure shown a two slit arrangement with a source which emits unpolarised light. P is a polariser with axis whose direction is not given. If I0 is the intensity of the principal maxima when no polariser is present, calculate in the present case, the intensity of the principal maxima as well as of the first minima.

To ensure almost 100 per cent transmissivity, photographic lenses are often coated with a thin layer of dielectric material. The refractive index of this material is intermediated between that of air and glass (which makes the optical element of the lens). A typically used dielectric film is MgF2 (n = 1.38). What should the thickness of the film be so that at the center of the visible spectrum (5500 Å) there is maximum transmission.

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.

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 need to be rotated further to reduce the output intensity to be zero, is ______.


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