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Q.

In the young’s double slit experiment a point source of λ=5000A∘ is placed slightly off the central axis as shown in the figure. If 70th order maximum is formed at P, the value of n is. 

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answer is 5.

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Detailed Solution

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The path difference is, 

Δx=SS2+S2P-SS1+S1P

=dsinθ1+dsinθ2

∴Δx=y1 dD1+y2 dD2=70(λ)

10-3×10×10-31+n×10-3×10×10-32=705×10-7

On solving we get n=5.

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