Question

plz answer this question.​

Answer 1

Explanation:

*Power of a lens is the degree of convergence

of divergence of light rays achieved by a lens.

**Lens L1 : f1

=

+10 cm ; Convex lens

**Lens L2: f2

= +20 cm ; Convex lens

**Lens L3 : f3

= -10 cm; Concave lens

*Lens L2 will form a virtual and magnified image

of an object placed at 15 cm from the convex lens because concave lens can never

form virtual and magnified image of an object

and convex lens form such image only when the

object is placed between the optical centre and

principle focus of the convex lens