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Q.

In YDSE Violet light of wavelength $4200 \overset{0}{A}$ is used. Find the slit separation in setup so that third minimum is obtained on screen at an angle $30^{0}$ (nearly)

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a

$1 μ m$

b

$2 μ m$

c

$3 μ m$

d

$4 μ m$

answer is B.

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Detailed Solution

Path diff $= S_{2} P - S_{1} P = d \sin θ$

$Δ = (2 N + 1) \frac{λ}{2}$

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