If a concave and convex lens of equal focus are kept in contact what is the effective focal length?

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If a concave and convex lens of equal focus are kept in contact what is the effective focal length?

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Answer 1 · 2016-02-12T17:18:28

Effective focal length in $\infty$ $oo$ .

Explanation:

When two lenses are kept in contact, powers of the lenses are simply added.

Power of a lens is positive for convex lens and negative for concave lens.

Numerically power of a lens is given by $\frac{100}{f}$ $100/f$ were $f$ $f$ is focal length in centimeters.

As numerically, focal length is same but opposite in size, combined power will be $Z e r o$ $Zero$ i.e. focal length is $\infty$ $oo$ i.e. it is just equivalent to plane glass,

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If a concave and convex lens of equal focus are kept in contact what is the effective focal length?

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