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In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is 2.4 m. If the experiment is carried out in another medium having refractive index 1.2 , the fringe width will be _____ m.

Options

  1. A1.2
  2. B2
  3. C2.4
  4. D2.88

Correct answer

B. 2

Step-by-step solution

The fringe width in Young's double slit experiment is given by = D d . When the experiment is performed in a medium of refractive index , the wavelength of light becomes ' = . The new fringe width is ' = ' D d = D d = . Substituting the given values, = 2.4 m and = 1.2 : ' = 2.4 1.2 = 2 m. Answer: 2

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