Question

What is the power of lens if the far point of a short -sighted eye is 200 CM?

Answer 1

for short sighred person we use corrective lens, the conacave lens. So we have

v = -200cm u = infinity(○)
so by lens formula
1/f = 1/v-1/u

=1/-200 - 1/○

1/f = 1/-200 (1/○ =0)

so f = -200cm

so p = 100/ f(cm)
= 100/ -200
p= -0.5D

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