Question

one convex lens of power 4D and concave lens of power -2.5 D are put in contact .The combination behaves as a a)convex lens b)concave lens c) convex mirror d) concave mirror GIVE REASON PLS

Answer 1

hey

power of combination of lens will be

=4 + ( -2.5)

=+1.5 D

and we know convex lens has positive power

so answer will be convex lens