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Two slits are separated by a distance of...

Two slits are separated by a distance of `0.5mm` and illuminated with light of `lambda=6000Å`. If the screen is placed `2.5m` from the slits. The distance of the third bright image from the centre will be

A

`1.5mm`

B

3 mm

C

6 mm

D

9mm

Text Solution

Verified by Experts

The correct Answer is:
D
Distance of nth bright fringe from the centre,
`y_(n)=(nDlambda)/d`
`"So "y_(3)=(3xx6000xx10^(-10)xx2.5)/(0.5xx10^(-3))`
`=9xx10^(-3)m=9mm`
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