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A plane monochromatic light wave falls n...

A plane monochromatic light wave falls normally on a diaphragm with two narrow slits separated by 2.5mm. The fringe pattern is formed on a screen 100 cm behind the diaphragm. By what distance will these fringes be displaced, when one of the slits is covered by a glass plate ` (mu = 1.5)` of thickness `10 mu m ?`

A

2mm

B

1mm

C

3mm

D

4mm

Text Solution

Verified by Experts

The correct Answer is:
A
Shift = `((mu-1)tD)/d`
` = ((1.5-1)(10 xx 10^-6)(1.0))/(2.5 xx 10^-3)`
` = 2 xx 10^-3m`
=2mm .
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