1.

In a single slit diffraction set up, second minima is observed at an angle of 60°. The expected position of first minima is(1) 25° (2) 20° (3) 30° (4) 45° 

Answer»

Answer is (1)

For 2nd minima

d sinθ = 2λ

sinθ = √3/2 (given)

⇒ λ/d = √3/4   ...(i)

So for 1st minima is

d sinθ = λ

sinθ = λ/d = √3/4 (from equation (i))

θ = 25.65° (from sin table)

θ ≈ 25°



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