Two polaroids are crossed to each other. When one of them is rotated through 
, then what percentage of the incident unpolarised light will be transmitted by the polaroids?
Text Solution
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Initially the polaroids are crossed to each other, that is the angle between their polarising directions is 
. When one is rotated through 
, then the angle between their polarising directions will become 
.
Let the intensity of the incident unpolarised light 
Then the intensity of light emerging from the first polaroid is 
This light is plane polarised and passes through the second polaroid.
The intensity of light emerging from the second polaroid is 
the angle between the polarising directions of the two polaroids.
As 
and 
So, 
Transmission percentage 
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