If the far point of eye lens is 10 m, find power of the lens required to correct the defect.
Far point of the eye lens = v
v = -10 m
Object distance = u
u = ∞
Lens Formula:
Power of lens, P = 1/f
= -10 D
Hence the power of the lens required to correct the defect is -10 D. The lens used is a concave lens.