Question

A myopic eye is not able to see distinctly the objects placed beyond 2 m from it. Determine the nature, the focal length and the power of lens used to correct the defect.

Answer 1

u=infinity
v=-2m
1/f=1/v-1/u
1/f=-1/2 -1/infinity
1/f=-1/2
f=-2m
p=1/f
p=1/-2
p=-0.5 D
the nature of lens is concave lens
focal length is -2m
and power of the lens is -0.5 dioptres

Answer 2

Hope it will help you..