The radius of curvature of the left \& right surface of the concave lens are \( 10 \mathrm{~cm} ....

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The radius of curvature of the left \& right surface of the concave lens are \( 10 \mathrm{~cm} \& 15 \mathrm{~cm} \) respectively. The radius of curvature of the mirror is \( 15 \mathrm{~cm} \).
P
(1) equivalent focal length of the combination is \( -18 \mathrm{~cm} \)
(2) equivalent focal length of the combination is \( +36 \mathrm{~cm} \)
(3) the system behaves like a concave mirror
(4) the system behaves like a convex mirror.


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