1.

As per the cartesian sign convention followed for mirrors and lenses

Answer»

focal LENGTH of concave mirror and concave lens is negative
focal length of concave mirror and CONVEX lens is negative
focal length of convex mirror and convex lens is negative
focal length of convex mirror and concave lens is negative

Solution :As PE the new Cartesian sign convention FOLLOWED focal length of a concave mirror as well as of a concave lens is taken with negative sign.


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