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प्रश्न
Why does an unpolarised light incident on a polaroid get linearly polarised ?
How does one get linearly polarised light with the help of a polaroid?
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उत्तर १
When unpolarised light is passed through a polaroid crystal, only those vibrations of light pass through the crystal that are parallel to the axis of the crystal. All other vibrations will be absorbed by the crystal. In this way, the unpolarised light incident on a polaroid gets linearly polarised.
उत्तर २
We get linearly polarised light with the help of a polaroid as shown below:
The naked eye or the polariser cannot distinguish between unpolarised and plane polarised light. A crystal called analyser is used to analyse the nature of light.
If the axis of the polariser and the analyser are parallel to each other, the intensity of light is found to remain unaffected.
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संबंधित प्रश्न
A beam of unpolarised light is incident on a glass-air interface. Show, using a suitable ray diagram, that light reflected from the interface is totally polarised, when μ = tan iB, where μ is the refractive index of glass with respect to air and iB is the Brewster's angle.
Show, with the help of a diagram, how unpolarised sunlight gets polarised due to scattering.
What is the Brewster angle for air to glass transition? (Refractive index of glass = 1.5)
The glass plate of refractive index 1.732 is to be used as a polarizer, its polarising angle is _______.
Green light is 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.
Explain how an unpolarised light gets polarised when incident on the interface separating the two transparent media.
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.
What is a analyser?
State Brewster’s law.
Polarisation of light is the only phenomenon that establishes ______.
