Home
Class 12
PHYSICS
Two nicols are so oriented that the maxi...

Two nicols are so oriented that the maximum amount of light is transmitted. To what fraction of its maximum value is the intensity of transmitted light reduced when the analyser is rotated through (i) `30^(@)` (ii) `60^(@)` ?

Text Solution

Verified by Experts

Net intensity transmitted is
`I = I_(0) cos^(2) theta`
(i) Here, `theta = 30^(@)`
`:. I = I_(0) (cos 30^(@))^(2) = I_(0) ((sqrt(3))/(2))^(2)`
`I = (3)/(4)I_(0) = 0.75 I_(0) = 75% I_(0)`
`:.` Intensity transmitted is reduced to `75%` of the maximum intensity.
(ii) Here, `theta = 60^(@)`
`I = I_(0) cos^(2) theta = I_(0) (cos 60^(@))^(2)`
`= (I_(0))/(4) = 0.25I_(0) = 25% I_(0)`
`:.` Intensity transmitted is reduced to `25%` of the maximum intensity.
Promotional Banner

Topper's Solved these Questions

  • OPTICS

    PRADEEP|Exercise Very short answer question|5 Videos

  • OPTICS

    PRADEEP|Exercise very short answer questions|1 Videos

  • MAGNETIC EFFECT OF CURRENT AND MAGNETISM

    PRADEEP|Exercise Competition Focus (Multiple Choice Questions)|2 Videos

Similar Questions

Explore conceptually related problems

Two nicols are so oriented that the maximum amount of light is transmitted. To what fraction of its maximum value is the intensity of transmitted light reduced when the analyser is rotated through (i) 45^(@) (ii) 90^(@) (iii) 180^(@) . ?

A polariser and an analyser are oriented so that the maximum amount of lights is transmmitted. Fraction of its maximum value is the intensity of the transmitted through reduced when the analyzer is rotated through (intensity of incident light = I_(o) ) , a) 30^(@) , b) 45^(@) , c) 60^(@)

A polariser and an analyser are oriented so that maximum light is transmitted what will be the intensity of outcoming light when analyer is rotated through 60^(@) .

Disuss the intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids ?

Two polariods are oriented with their transmision axes making angle of 30^(@) with each other. The fraction of incident un polarised light is transmitted

Unpolarised light of intensity I is incidnet of the polaroid. What will be the intensity of light transmitted by the polaroid?

When a polaroid sheet is rotated between two crossed polaroids, the intensity of the transmitted will be maximum, when angle theta between pass axes is