Question

focal length of lens of power -0.5D

Answer 1

Answer:

The power of a lens is defined as the reciprocal of itsfocal length in meters, or D = 1/f, where D is thepower in diopters and f is the focal length in meters.Lens surface power can be found with the index of refraction and radius of curvature.

f=1/p

p=1/f

p=1/-0.5=-2