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An interference pattern was made by usin...

An interference pattern was made by using red light. If the red light changes with blue light, the fringes will become

A

Wider

B

narrower

C

Fainter

D

Brighter

Text Solution

Verified by Experts

The correct Answer is:
B
Fringe width `beta=(betaD)/(d)`
`(beta_(Red))/(beta_(Blue))=(lamda_(Red))/(lamda_(Blue)),` Since, `lamda_(Blue) lt lamda_(Red)`
`therefore` Fringe width with blue light `lt` Fringe width with red light. Fringes become narrower with blue light.
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