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प्रश्न
Show, via a suitable diagram, how unpolarised light can be polarised by reflection.
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उत्तर
An ordinary beam of light on reflection from a transparent medium becomes partially polarised. The degree of polarisation increases as the angle of incidence is increased. At a particular value of angle of incidence, the reflected beam becomes completely polarised. This angle of incidence is called the polarising angle (p).
When light is incident at polarising angle at the interface of a refracting medium, the refractive index of the medium is equal to the tangent of the polarising angle.
μ = tan p
where
μ → Refractive index of the refracting medium
p → Polarising angle
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संबंधित प्रश्न
For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.
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 is the Brewster angle for air to glass transition? (Refractive index of glass = 1.5)
Which of the following properties shows that light is a transverse wave?
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 polariser?
What is plane polarised light?
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?
