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In the double-slit experiment, the dista...

In the double-slit experiment, the distance of the second dark fringe from the central line are `3 mm`. The distance of the fourth bright fringe from the central line is

A

6 mm

B

8 mm

C

12mm

D

16 mm

Text Solution

Verified by Experts

The correct Answer is:
B
`x_(n("bright"))= n beta " " :. x_(4b)= 4 beta`
and `x_(n("dark"))=(2n-1)b//2 " ":. x_(2b)=1.5 beta`
`:.x_(4)= (4)/(1.5)xx(4xx3)/(1.5)=8 mm`
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