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तीव्रता `I_(0)` का समतल-ध्रुवीय प्रकाश एक पोलरॉइड पर आपतित होता है , जिसकी ध्रुवण दिशा (संचरण अक्ष ) आपतित प्रकाश में वैधुत वेक्टर की दिशा से `60^(@)` कोण बनाती है। निर्गत प्रकाश की तीव्रता, आपतित तीव्रता `I_(0)` के पद में ज्ञात कीजिए ।

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मैलस के नियम से , पोलरॉइड से निर्गत प्रकाश के तीव्रता
`I=I_(0) cos^(2)theta`.
यहाँ `" "theta=60^(@)." "therefore" "I=I_(0)cos^(2)60^(@)=(1)/(4)I_(0).`

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