Question

The far point of a person is 180 cm from the eye. What should be the power of remedial lens?​

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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