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A converging lens of focal length 5.0cm ...

A converging lens of focal length `5.0cm` is placed in contact
with a diverging lens of focal length `10.0cm.` Find the combined focal length of
the system.

Text Solution

Verified by Experts

Here `f_1=+5.0cm and f_2=-10.0cm`
Therefore, the combined focal length F is given by
`1/F=1/f_1+1/f_2=1/5.0-1/10.0=+ 1/10.0`
`therefore F=+10.0cm` i.e, the combination behaves as a converging lens of focal length 10.0cm
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