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Question

If the Young's apparatus is immersed in water, the effect on fringe width will ________


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Explanation

Young’s Double Slit Experiment

This makes use of two coherent sources of light which are placed at a small distance, only a few orders of magnitude greater than the wavelength of light is used. It helped us to understand the wave theory of light.

  1. Lasers are used as coherent sources in this experiment.
  2. Every source can be a source of coherence for a light wave.
  3. At any point on the screen at a distance ‘y’ from the center, the waves travel distances l1 and l2 to create a path difference of Δl at the point in question.
  4. The point approximately subtends an angle of θ at the sources.

The wavelength of light is less in water than in air. Hence, the fringe width will decrease. The interference pattern will be observed, but the fringes will be narrower.

Thus, If Young’s apparatus has been immersed with water, then the effect for fringe width will be narrower.


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