If the source of light used in a Young's double slit experiment is changed from red to violet:

Question:

If the source of light used in a Young's double slit experiment is changed from red to violet:

  1. the fringes will become brighter.

  2. consecutive fringe lineswill come closer.

  3. the central bright fringe will become a dark fringe.

  4. the intensity of minima will increase.


Correct Option: , 2

Solution:

(2)

$\beta=\frac{\lambda \mathrm{D}}{\mathrm{d}}$

As $\lambda_{\mathrm{v}}<\lambda_{\mathrm{R}}$

$\Rightarrow \beta_{\mathrm{v}}<\beta_{\mathrm{R}}$

$\therefore$ Consecutive fringe line will come closer.

$\therefore(2)$

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