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Two polarising sheet have their polarisi...

Two polarising sheet have their polarising directions parallel so that the intensity of the trasmitted light in maximum. Through what angle must the either sheet be turned if the intensity is to drop by one- half?

Text Solution

Verified by Experts

Here, `I = (I_(o))/(2)`
Using Malus law, `I = I_(o) cos^(2) theta`
`(l_(o))/(2) = I_(o) cos^(2) theta`
`cos thets = pm (1)/(sqrt(2))`
`theta pm 45^(@), pm 135^(@)`
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