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NEET 2019 · YDSE: Film, Medium & Two Wavelengths

YDSE: Film, Medium & Two Wavelengths question from NEET 2019

Q57NEET 2019Easy

YDSE: Film, Medium & Two Wavelengths

In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1m away, was found to be 0.2°. What will be the angular width of the first minima, ( $\mu$ water = 4/3) if the entire experimental apparatus is immersed in water?

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Answer: (a)

Angular width $\propto \lambda$ ; in water $\lambda' = \frac{\lambda}{\mu}$ .
$\theta' = \frac{0.2^\circ}{4/3} = 0.15^\circ$
So the answer is (a) 0.15°.

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