Question

a beam of natural light falls on a system of 5 Polaroid s which are arranged in succession such that the pass axis of each polarid is turned through 60 degree with respective to the preceding one . the fraction of incident light that passes through the system​

Answer 1

The fraction of incident light that passes through the system​ is given below:

Explanation:

Given :-

Beam of natural light falls on a system of 5 Polaroids.

The pass axis of each polarid is turned through 60 degree

After passing through I st polaroid,  

  I = Io / 2

After passing through next 4 polaroids

  I = Io / 2 . { cos^2 (60) }^4

  I = Io / 2 . ( 1 / 4 )^4

  I = Io / 2 . 1 / 216  

  I = Io / 512

 hence,  I = 1 / 512

Therefore, the fraction of incident light that passes through the system​ is      1 / 512.

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