In Young's double slit experiment, if the source of light changes from orange to blue then :

Question:

In Young's double slit experiment, if the source of light changes from orange to blue then :

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

  2. the distance between consecutive fringes will decrease

  3. the distance between consecutive fringes will increase. 

  4. the intensity of the minima will increase. 

Correct Option: , 2

Solution:

Sol. Fringe width $=\lambda \mathrm{D} / \mathrm{d}$

as $\lambda$ decreases, fringe width also decreases

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