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A convax lens of focal length 10.0cmis p...

A convax lens of focal length `10.0cm`is placed in contact with a convex lens of `15.0cm` focal length ,What is the focal length of the combination.

Text Solution

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for combination of lenses
`(1)/(f)=(1)/(f_(1))+(1)/(f_(2))`
`=(1)/(10)+(1)/(15)`
`=(25)/(150)=(1)/(6)`
Therefore,`f=6cm`
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