In Young’s double slit experiment a slit is covered with thin film so that the optical path difference introduced between coherent waves is 5 $λ$ . Now the new position of central maximum will be at

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the initial position of 5^th maximum

the initial position of 3^rd maximum

the initial position of 2^nd minimum

the initial position of 3^rd minimum

answer is A.

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Detailed Solution

Shift in central maximum = $\frac{Δ x D}{d} = \frac{5 λ D}{d}$ $= \frac{n λ_{D}}{d}$

n = 5

The distance of 5^th maximum from central maximum is $\frac{5 λ D}{d}$

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