Two coherent sources $S_1, S_2$ and a screen are arranged as shown in the figure. If the distance between…

Two coherent sources $S_1, S_2$ and a screen are arranged as shown in the figure. If the distance between the two coherent sources is $n \lambda$ and the distance of the screen from the nearer coherent source is D, then the distance of the first bright fringe on the screen from the point ' $\mathrm{O}$ ' is ( $\lambda$ is the wavelength of the light emitted by the coherent sources )
  1. $\sqrt{\frac{D(D+n \lambda)}{n}}$
  2. $\sqrt{\frac{2 D(D+n \lambda)}{n}}$
  3. $\sqrt{\frac{3 \mathrm{D}(\mathrm{D}+\mathrm{n} \lambda)}{\mathrm{n}}}$
  4. $\sqrt{\frac{D(D+n \lambda)}{2 n}}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2018 (24 Apr Shift 2)

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