question_answer

State three differences between a convex and a concave lens.

Answer:

S. No.	Convex Lens	Concave Lens
(i)	Thick at middle, thin at edges.	Thin at middle, thick at edges.
(ii)	Can form real image.	Cannot form real image.
(iii)	It converges the incident rays towards the principal axis.	It diverges the incident rays away from the principal axis.