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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° |
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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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