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NEET2026PhysicsChapterActual

Given below are two statements related to Young's double slit experiment: Statement I: If the separation between the two slits is doubled, the angular width of the interference fringes becomes twice its initial value. Statement II: If the entire experimental apparatus is immersed in a transparent liquid, the linear fringe width decreases. In the light of the above statements, choose the correct answer from the option

Options

  1. ABoth Statement I and Statement II are true.
  2. BBoth Statement I and Statement II are false.
  3. CStatement I is true but Statement II is false.
  4. DStatement I is false but Statement II is true.

Correct answer

D. Statement I is false but Statement II is true.

Step-by-step solution

The angular width of interference fringes in Young's double slit experiment is given by = d , where is the wavelength of light and d is the separation between the slits. If the separation between the slits is doubled ( d' = 2d ), the new angular width becomes ' = 2d = 2 . The angular width becomes half of its initial value. Thus, Statement I is false. The linear fringe width is given by = D d . When the entire apparatus is immersed in a transparent liquid of refractive index > 1 , the wavelength of light in the liq

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