A plane polarised light is incident normally on a tourmaline plate. Its 
vector make an angle of 
with the optic axis of the plate. Find the percentage difference between initial and final intensities.
Text Solution
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According to law of Malus, when a beam of completely plane polarised light is incident on an analyser, the resultant intensity of light 
transmitted from an analyser varies directly as the square of cosine angle between plane of analyser and polariser. Let initial intensity is 
and final intensity is 
, then
Now, 
difference between initial and final intensities,
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