In the figure S1 and S2 are two narrow slits illuminated by light of wavelength

Question

In the figure

S_{1}

and

S_{2}

are two narrow slits illuminated by light of wavelength

^{'} λ^{'}

and they ae in phase. `P' is a point on the screen which corresponds to 4th minimum then the path difference

S_{2} P - S_{1} P

is equal to

Options:

A . 4λ

B . 5λ2

C . 7λ2

D . 2λ

Answer: Option C
:
C

x = (2 n - 1) \frac{λ}{2}; n = 4

= (2 \times 4 - 1) \frac{λ}{2}

= (8 - 1) \frac{λ}{2}

= 7 \frac{λ}{2}

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