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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

1.5 mm

B

3mm

C

6 mm

D

9 mm

Text Solution

Verified by Experts

The correct Answer is:
D
Distance of nth bright fringe from the center,
`y_(n) = (nDlambda)/d`
`therefore y_(3) = (3 xx 6000 xx 10^(-10) xx 2.5)/(0.5 xx 10^(-3))= 9 xx 10^(-3)m = 9mm`
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