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How does focal length of a convex lens c...

How does focal length of a convex lens change if violet light is used instead of red light.

Text Solution

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`(1)/(f_(v)) = (mu_(v) - 1)((1)/(R_(1)) - (1)/(R_(2)))`
`(1)/(f_(r )) = (mu_(r ) - 1)((1)/(R_(1)) - (1)/(R_(2)))`
As `mu_(v) gt mu_(r ) :. f_(v) lt f_(r )`
i.e., focal length decreases.
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Finding Focal Length Of A Convex Lens

Assertion : The focal length of the lens does not change when red light is replaced by blue light. Reason : The focal length of lens does not depends on colour of light used.