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  4. The intensity observed in an interference pattern is, I=I0sin2θ . At θ =30° , intensity is, I=(5 ± 0 . 002)Wm- 2 . The percentage error in angle if I0=20Wm- 2 is,

Q. The intensity observed in an interference pattern is, . At , intensity is, . The percentage error in angle if is,

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Solution:


Differentiating both sides we get,

or

Therefore,
and .

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