Question

A person needs a lens of power-4.5d for correction of her vision .What. Is the focal length of corrective lens.What is the nature of corrective lens

Answer 1

HERE IS YOUR ANSWER:

Given, D = -4.5
f = ?
So, f = 1/-4.5
= -10/45
= -0.2 m

Therefore, the lens is concave lens, that is, diverging lens which will help person to see farther objects.

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Answer 2

D= 1/f cross multiply f= 1/D the answer is - 2/9.

The nature of the corrective lens is concave as its myopia because its in negative.


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