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In a two-slit interference pattern, the ...

In a two-slit interference pattern, the maximum intensity is `l_0`.
(a) At a point in the pattern where the phase difference between the waves from the two slits is `60^@`, what is the intensity?
(b) What is the path difference for 480nm light from the two slits at a point where the phase angle is `60^@`?

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`(a) 0.75I_0 , (b) 80 nm`
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