NEET 2019 Physics question
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 1 m away, was found to be . What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? ()
Answer: (2)
Solution
The angular fringe width is , which is proportional to the wavelength of light used. When the whole apparatus is immersed in water the wavelength becomes while the slit separation
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