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In a Young's double slit experiment, a laser light of 560 nm produces an interference pattern with consecutive bright fringes' separation of 7.2 mm. Now another light is used to produce an interference pattern with consecutive bright fringes' separation of 8.1 mm. The wavelength of second light is ______ nm.

Asked in JEE Main 28th July 1st Shift 2022 · Fringe width and fringe position

Answer: 630

Step-by-step solution

With the same set-up, β ∝ λ.

λ₂ = 560×(8.1)/(7.2) = 630 nm.

→ 630

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