CBSE Class 12-science Answered

Dear student

As per malus law,

the % of transmitted intensity through two polaroids is

I=Iocos^2 (theta) where theta is the angle between incident & transmitted light.

When two polaroids are crossed to each other, (theta) = 90, & transmitted intensity  I =0

When one of the polaroid turned thru 60 degees, the angle theta between the two polarising lines = 90-60 = 30, hence the transmitted intensity I'=Iocos^2 (30)

% of transmitted intensity through two polaroids = I'/Io  x100 = 75%

Regards

Team

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