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In a double-slit experiment, green l...

In a double-slit experiment, green light `(5303 Å)` falls on a double slit having a separation of `19.44 mum` and a width of `4.05 mum `. The number of bright fringes between the first and the second diffraction minima is:

A

10

B

4

C

9

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
Let sidth of each slit be `a = 4.05mum`
Separation between slits `d = 19.44 mum`
Width of each interference fringe: `W = (lamda D)/(d)`
No. of fringes between Ist and Iind Minima of diffraction:
`N = (lamda D//a)/(lamda D //b) = d/a =4.8, N 5.`
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