question_answer

Distinguish between a convex lens and a concave lens.

Answer:

                             

Convex lens	Concave lens
1. It is thicker at the centre than at the edges.	It is thinner at the centre than at the edges.
2. It converges a parallel beam of light on refraction through it.	It diverges a parallel beam of light on refraction through it.
3. It has a real focus.	It has a virtual focus.