Power of a lens is
A. equal to its focal length
B. reciprocal of the focal length (in metres)
C. square of its focal length (in metres)
D. reciprocal of its radius of curvature.
Answer:B
Power of a lens is
A. equal to its focal length B. reciprocal of the focal length (in metres) C. square of its focal length (in metres) D. reciprocal of its radius of curvature.