Question

A person needs a lens of a power -4.5 d for correction of his vision
a) what kind of defect in vision is suffering from?
b) what is focal length of corrective lens?
c) what is nature of tha corrective lens?

Answer 1

a) The person is suffering from myopia (short-sightedness).
b) f=1/-4.5
= -0.22m
c) Concave lens of appropriate power can be used to correct this disease.
-diverging lens.

Answer 2

✨✨✨Here is your answer ✨✨✨✨✨

a) The person is suffering from myopia.
b) The focal length of the lens is :
f=1/p
=1/-4.5
=1×10/-4.5
=-0.22m
so, the focal length of the lens is -0.22m
c) The nature of the corrective lens is concave lens.

Hope it may help you ✨ ✨✨✨✨✨✨✨