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प्रश्न
What is the difference between polarised light and unpolarised light?
Differentiate between polarised and unpolarised light.
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उत्तर
| S.No. | Polarised light | Unpolarised light |
| 1. | Consists of waves having their electric field vibrations in a single plane normal to the direction of ray. | Consists of waves having their electric field vibrations equally distributed in all directions normal to the direction of ray. |
| 2. | Asymmetrical about the ray direction | Symmetrical about the ray direction |
| 3. | It is obtained from unpolarised light with the help of polarisers | Produced by conventional light sources. |
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संबंधित प्रश्न
If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................
Draw a neat labelled diagram showing the plane of vibration and plane of polarisation for polarised light.
Show, using a simple polaroid, that light waves are transverse in nature. Intensity of light coming out of a polaroid does not change irrespective of the orientation of the pass axis of the polaroid. Explain why.
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
Show, via a suitable diagram, how unpolarised light can be polarised by reflection.
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.
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.
Explain how an unpolarised light gets polarised when incident on the interface separating the two transparent media.
What is a polariser?
What is a analyser?
What is plane polarised light?
What is unpolarised light?
State and obtain Malus’ law.
What is the angle of polarisation and obtain the equation for an angle of polarisation?
Discuss about Nicol prism.
How is polarisation of light obtained by scattering of light?
Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive index?
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.
