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प्रश्न
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.
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उत्तर
(i) when the light is incident at the polarizing angle, the angle of refraction and angle of polarization are related according to the equation,
∠ip + ∠r = 90°
The angle of refraction is given as, 30°. So the angle of polarization, ∠ip = 90° - 30° = 60°
(ii) Applying Snell's law, we can write, the refractive index of the transparent media,` mu = sin"i"_"p"/sin "r"`
⇒ `mu = sin60^@/sin30^@ = (sqrt3/2)/(1/2) = sqrt3`
⇒ ` = mu sqrt3`
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संबंधित प्रश्न
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 ?
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.
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?
What is the difference between polarised light and unpolarised light?
What is a polariser?
What is the angle of polarisation and obtain the equation for an angle of polarisation?
The reflected light is found to be plane polarised when an unpolarized light falls on a denser medium at 60° with the normal. Find the angle of refraction and critical angle of incidence for total internal reflection in the denser to rarer medium reflection.
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.
