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In a biprism experimentn the the band wi...

In a biprism experimentn the the band width is found to be increased by 25% of the initial. If the distance between sliteand eyepeice is increased by 20 cm then the initial distance between slit and epepiece is

A

80 cm

B

90 cm

C

70 cm

D

60 cm

Text Solution

Verified by Experts

The correct Answer is:
A
`beta_(2)=1.25 beta_(1) and D_(2)=D_(1)+0.2`
`rArr (D_(2))/(d) lambda=1.25 D_(1)`
`D_(1)=(0.2)/(0.25)=0.8 mm =80 cm`
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