Question

a person with myopic eye is not able see beyond 3m determine the nature and focal length and poweyof the correcting lens

Answer 1

given ,v = -3m or -300cm
u = -infinity
f = ?
according to lens formula ,
1/f = 1/v - 1/u
1/f = -1/300 - (-1/infinity)
1/f = -1/300 + 1/infinity
focal length = -300 cm or -3metre

now,
power = 1/focal length(metre)
power = -1/3
power = -0.33 dioptre

nature = myopia ( short sightedness)

Answer 2

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