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In a double slit experiment, when light of wavelength 400   n m 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? μ w a t e r = 4 3

Options

  1. A0.266 °
  2. B0.15 °
  3. C0.05 °
  4. D0.1 °

Correct answer

B. 0.15 °

Step-by-step solution

In air angular fringe width is given by, θ = λ d . Angular fringe width in water, θ ' = θ μ = 0.2 4 3 = 0.15 °

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