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State Brewster’s law. - Physics

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प्रश्न

State Brewster’s law.

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उत्तर

The law states that the tangent of the polarising angle for a transparent medium is equal to its refractive index, tan i = n. This relation is known as Brewster’s law.

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अध्याय 7: Wave Optics - Evaluation [पृष्ठ १०३]

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सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
अध्याय 7 Wave Optics
Evaluation | Q 32. | पृष्ठ १०३

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.


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°.


Why does an unpolarised light incident on a polaroid get linearly polarised ?


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.


Using the phenomenon of polarisation, show how the transverse nature of light can be demonstrated.


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.


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?


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.


The transverse nature of light is shown in ______.


Discuss about pile of plates.


What is double refraction?


A plane mirror produces a magnification of


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.


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.


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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