Question

A person needs a lens of power - 4.5 dfor
correction of her vision.
a) what is defeet of vision is she suffering from
b) what is focallength of corrective lens?
e) what is the nature of corrective tens?

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Answer 1

Answer:a)Myopia

b) -22.22cm

c) Concave Lens

Explanation:

a) As the power of lens is negative it indicates that a person cannot see far away objects clearly. So the defect is myopia.

b) P=1/f (in metre)

-4.5=100/f

f=100/(-4.5)

f= -22.22cm