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JEE Main 2020 (2 Sep, Shift 2) · YDSE: Fringe Width & Fringe Positions

YDSE: Fringe Width & Fringe Positions question from JEE Main 2020 (2 Sep, Shift 2)

Q62JEE Main 2020 · 2 SEP · SHIFT 2Easy

YDSE: Fringe Width & Fringe Positions

In a Young’s double slit experiment, 16 fringes are observed in a certain segment of the screen when light of a wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would be

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Answer: (a)

Same segment: $n_1\lambda_1 = n_2\lambda_2$
$n_2 = \frac{16 \times 700}{400} = 28$
So the answer is (a) 28.

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