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you have a combination of concave and convex lens both have a focal length of 10 cm .
From sign convention:-
Convex lens has focal length of + 10cm or 0.1m.
Whereas,
Concave lens has a focal length of -10cm or -0.1m.
If you have a combination of lens, then you can calculate net power or focal length of combination by the formula :-
(I/net focal length) = (1/f1)+(1/f2)+…..
Here after putting values of f1=0.1m and f2= -0.1m ,
Answer will be 0.
Therefore, (1/net focal length) =0
Thus, net focal length= infinite
Thus it will behave as a plane mirror with focal length infinity.
But , the answer will be different if convex lens and concave length both has different refractive index.
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