JEE Main 2022 · 28 Jun · Shift 2 · Physics Q53

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PhysicsInteger+4 / -1Question 53 of 90

In a Young's double slit experiment, an angular width of the fringe is 0.35° on a screen placed at 2 m away for particular wavelength of 450 nm. The angular width of the fringe, when whole system is immersed in a medium of refractive index 7/5, is $\dfrac1\alpha$ . The value of $\alpha$ is ______.

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Answer and worked solution

Official answer: 4

In the medium the wavelength, and so the angular width, falls by $\frac75$ : $\frac{0.35°}{1.4}=0.25°=\frac14$ .

Answer: 4

Topics:Interference and Young's double slit

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JEE Main 2022 · 28 Jun · Shift 2, Physics question 53