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In young's double slit experiment, the fringe width is 12 mm . If the entire arrangement is placed in water of refractive index 4 3 , then the fringe width becomes (in mm )

Options

  1. A16
  2. B9
  3. C48
  4. D12

Correct answer

B. 9

Step-by-step solution

For a given light wavelength corresponding a medium of refractive index μ λ med   = λ vacumm   μ . And we know that fringe width β = λ D   d Therefore, β med   = β vacuum   μ = 12 4 3 = 9   mm

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