S1,S2 are two coherent sources of light. P is a point on the screen such that S2

Question

S_{1}, S_{2}

are two coherent sources of light. P is a point on the screen such that

S_{2} P - S_{1} P

= 0.01029 cm. Wave length of light used is

6000 ˙ A

. The order of the fringe formed at P is

Options:

A . 172, bright

B . 171, bright

C . 173, dark

D . 172, dark

Answer: Option D
:
D

x = (2 n - 1) \frac{λ}{2}

1029 \times 10^{- 7} = (2 n - 1) \frac{6000 \times 10^{- 10}}{2}

2 \times 171.5 = 2 n - 1

344 = 2 n

n = 172

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