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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

`09`

B

10

C

`04`

D

`05`

Text Solution

Verified by Experts

The correct Answer is:
D

Angle subtended by first and second diffraction minima
on the screen `= (lambda)/(a)`
Angular fringe width ` = (lambda)/( d)`
Number of bright fringes ` = ((lambda)/( a))/((lambda)/(d)) = (d)/(a) = (19.44)/(4.05) = 4.81 `
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