When monochromatic red light is used ins...

When monochromatic red light is used instead of blue light in a convex lens, its focal length will :-

increase

decrease

remain same

does not depend on colour of light

Text Solution

Verified by Experts

The correct Answer is:

`mu_(R)ltmu_(B)`
`(1)/(f)gt(mu-1)((1)/(R_(1))-(1)/(R_(2)))`
`(1)/(f_(B))gt(1)/(f_(R))`
`f_(R)gtf_(B)` .

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