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प्रश्न
State two uses of Polaroid.
उत्तर
Uses of Polaroid:-
(1) In motor car head lights – To remove headlight glare
(2) To improve color contrast in old oil paintings
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संबंधित प्रश्न
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.
What dose a polaroid consist of?
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. An 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 30° 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.
What is the Brewster angle for air to glass transition? (Refractive index of glass = 1.5)
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)`
State any two methods by which ordinary light can be polarised
Unpolarised light is incident on a polaroid. How would the intensity of transmitted light change when the polaroid is rotated?
Which of the following properties shows that light is a transverse wave?
Greenlight is an incident at the polarising angle on a certain transparent medium. The angle of refraction is 30°.
Find
(i) polarising angle, and
(ii) refractive index of the medium.
Light transmitted by Nicol prism is ______.
The transverse nature of light is shown in ______.
Discuss polarisation by selective absorption.
What is a analyser?
List the uses of polaroids.
Discuss about pile of plates.
What is double refraction?
What is normal focusing?
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?
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 perpendicular to the plane of the polaroid.
Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive index?
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.
