Advertisements
Advertisements
प्रश्न
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.
उत्तर
60° + r + 90° = 180°
60° + r = 90°
r = 30°
Angle of refraction = 30°
c = ?
`mu = 1/(sin "c")`
`mu = (sin "i")/(sin "r")`
`mu = (sin 60)/(sin 30)`
= `(sqrt3/2)/(1/2)`
`= sqrt3`
`mu = 1/(sin "c")`
sin c = `1/mu`
sin c = `1/sqrt3`
c = `sin^-1 (1/sqrt3)`
c = 35.15°
APPEARS IN
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°.
Find an expression for intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids. In which position of the polaroid sheet will the transmitted intensity be maximum?
Two polaroids P1 and P2 are placed with their pass axes perpendicular to each other. An unpolarised light of intensity Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its pass axis makes an angle of 45° with that of P1. Determine the intensity of light transmitted through P1, P2 and P3
The refractive indices of glass and water w.r.t. air are 3/2 and 4/3 respectively. Determine the refractive index of glass w.r.t. water.
With the help of an experiment, state how will you identify whether a given beam of light is polarised or unpolarized?
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.
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 a analyser?
What is unpolarised light?
What is partially polarised light?
State and obtain Malus’ law.
State Brewster’s law.
Discuss about pile of plates.
What is double refraction?
Mention the types of optically active crystals with example.
How is polarisation of light obtained by scattering of light?
Which of the following phenomena is not common to sound and light waves?
Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive index?
