Question

power of lens is -0.5D then find its focal length lens

Answer 1

P=100/f(when focal length is in centimeters). If the focal length is expressed in metres, the power of a lens is the reciprocal of the focal length. It is given that the power of a lens is dioptre.

Answer 2

If power of lense is 0. 2 =20 then 0. 5 is 50 cm