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Two polarising sheets are arranged with ...

Two polarising sheets are arranged with their axes parallel so that the intensity of transmitted polarized light is maximum. Through what angle must the sheet be rotated so that the intensity of transmitted light drops to`1/3`of the maximum intensity?

Text Solution

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By law of Malus`I=I_(0)cos^(2) theta`But`I=(I_(0))/3 :.(I_(0))/3=I_(0)cos^(2) theta`
`cos theta=+-1/(sqrt(3))`Hence`theta=54.73^(@)`
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