Physics-

General

Easy

Question

# In the figure is shown Young’s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11^{th} fringe on the other side, as measured from Q. If the wavelength of the light used is , then will be equal to

## The correct answer is:

### P is the position of 11^{th} bright fringe from Q. From central position O, P will be the position of 10^{th} bright fringe.

Path difference between the waves reaching at P = S_{1}B =10 l = 10 ´ 6000 ´ 10^{–10} = 6 ´ 10^{–6}m

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### When one of the slits of Young’s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30^{th} bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20^{th} bright fringe

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