1.

If the intensity of unpolarized light after passing through a polarize (P) and an analyser (A) reduces to one eighth of its original value, then the angle between the principal planes of P and A is :

Answer»

`30^(@)`
`45^(@)`
`60^(@)`
`90^(@)`

Solution :Let a be the REQUIRED angle
`therefore I.= 1/2 cos^(2) a`
GIVEN , `I. = 1/8 I`
`therefore 1/8 I = 1/2 I cos^(2)a`
or `cos^(2)a = 1/4`
or `cos a = 1/sqrt2`
THUS`a = 45^(@)`


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