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NEET2026PhysicsChapterActual

In a Young's double slit experiment performed in air, the interference pattern is observed on a fixed screen. If the entire experimental apparatus is now completely immersed in a transparent liquid of refractive index 1.33 , what will be the effect on the linear fringe width and the angular fringe width?

Options

  1. ABoth the linear and angular fringe widths will increase.
  2. BBoth the linear and angular fringe widths will decrease.
  3. CThe linear fringe width will decrease, but the angular fringe width will remain unchanged.
  4. DThe linear fringe width will remain unchanged, but the angular fringe width will decrease.

Correct answer

B. Both the linear and angular fringe widths will decrease.

Step-by-step solution

The linear fringe width in air is given by = D d . The angular fringe width in air is given by = d . When the entire apparatus is immersed in a liquid of refractive index , the wavelength of light in the liquid becomes ' = . The new linear fringe width is ' = ' D d = D d = . The new angular fringe width is ' = ' d = d = . Since the refractive index of the liquid is = 1.33 > 1 , both ' and ' will be less than their initial values in air. Therefore, both the linear and angular fringe widths will decrease. Answer: Bot

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