Question

A person needs a lens of power 4.5 D for correction of her vision.
(a) What kind of defect in vision is she suffering from?
(b) What is the focal length of the corrective lens?
(c) What is the nature of the corrective lens?
____________
please answer all three parts with proper explanation and drawing.
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Answer 1

Answer:

hiii

buddy here is your answer

Explanation:

P=-4.5D

 since the power of the lens is negative, it is a concave lens.

So the defect from which Noopur is suffering from is Myopia.

f=1/P

f=1/-4.5

f=-0.2222m

f=-22.22m

the defect is myopia and it is caused by

a) increase in the curvature of the lens or decrease in focal length of eye lens

b) elongation of eye ball.

(Sorry I could"t down load the images but you can refer the NCERT book for the diagrams)

hope it will help you

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