Prev quesNext ques Q. Find the power of a concave lens of focal length 2 m. Answer:- Here given : Focal length of lens f = − 2 m Power of concave lens P = ? 1 P = − f 1 P = − 2 P = − 0.5 dioptre The power of concave lens is − 0.5 dioptre Prev quesNext ques