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Light of wavelength 5000 Å, illuminates ...

Light of wavelength 5000 Å, illuminates the slit in a biprism experiment. If it is replaced by light of wavelength 6500 Å, then the fringe width will

A

increase by 20%

B

decrease by 20%

C

increase by 30%

D

decrease by 30%

Text Solution

Verified by Experts

The correct Answer is:
C
`X_(2)/X_(1)=(lamda_(2))/(lamda_(1))=1.3" "therefore X_(2)=1.3X_(1)`
`therefore` X increases by 30%.
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