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In Young's double-slit experiment, the p...

In Young's double-slit experiment, the point source is placed slightly off the central axis shown in Fig. 2.45.(`lambda`=500 nm)
a. Find the nature and order of the interference at point P.
b. Find the nature and order of the interference at point. O.

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70th maxima: (b) 20th maxima, (c) `t=20mum `infront of `S_1`
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