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Q.

In young double slit interference experiment wave length of light used is $5000 Å .$ If the path difference between waves reaching at a point P on the screen is 1 micron, then at the point ‘P’

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a

Second bright band occurs

b

Second dark band occurs

c

Third bright band occurs

d

Third dark band occurs

answer is A.

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Detailed Solution

$\frac{Δ x}{λ / 2} = \frac{1 \times 10^{- 6}}{2.5 \times 10^{- 7}} = 4$

$Δ x = 4 λ / 2 . = 2 λ$

the path difference for 2nd maxima.

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