In a double slit experiment, when light of wavelength 400 n m was used, the angular width of the first…

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 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? μwater=43
  1. 0.266°
  2. 0.15°
  3. 0.05°
  4. 0.1°

Solution

In air angular fringe width is given by, θ=λd.
Angular fringe width in water,  θ'=θμ=0.243=0.15°

Asked in: NEET 2019 (All India)

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