Question

A short-sighted person cannot see clearly beyond 5m. Calculate the power of lens required to correct his vision to normal?

Answer 1

f  = – 5m

P = \(\frac { 1 }{ f }\) = –\(\frac { 1 }{ 5 }\) 

= 0.20 =0.20

∴ Power = 0.2 Dioptre