1.

Two niclos are crossed to each other.Now one of them is rotated through 60^(@).What percentage of incident light will pass through the system?

Answer»

`12%`
`24%`
`37.5%`
`52%`

SOLUTION :TRANSMISSION of light for incident unpolarised light is 50%.
Intensity of light emerging from second nicol prism is
`I_(theta) = 1/2 I_(0) cos^(2)theta (Malus law)`
`theta = 90^(@) - 60^(@) = 30^(@)`
`I_(theta)/(I_(0)) = (cos^(2)30^(@))/(2) = 3/8`
% transmission = `(I_(theta))/(I _(0)) xx 100 = 3/8 xx 100`
` = 37.5 %`


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