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JEE Main 2022 (26 Jul, Shift 1) · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from JEE Main 2022 (26 Jul, Shift 1)

Q49JEE Main 2022 · 26 JUL · SHIFT 1Easy

YDSE: Film, Medium & Two Wavelengths

In Young's double slit experiment, the fringe width is $12\text{ mm}$ . If the entire arrangement is placed in water of refractive index $\frac{4}{3}$ , then the fringe width becomes (in mm):

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Answer: (b)

In water $\beta' = \frac{\beta}{\mu}$ .
$\beta' = \frac{12}{4/3} = 9$ mm
So the answer is (b) 9.

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