Question

Aniket fron std. X uses spectacle's. The power of the lenses in his spectacles is -0.5D .Asnwer the following questions: (a) State the type of lenses used in his spectacles (b) Name the defect of vision Aniket is suffering from. (C) Find the focal length of the lenses in his spectacles.

Answer 1

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a) The type of the lenses used in his spectacles is

concave lens as the power of the lens is negative.

b) The defect of vision Aniket suffering from is myopia (nearsightedness).

c) Given : Power of a concave lens ⟶ - 0.5 D

To find : The focal length of the lens (f)

Solution :

We know that,

P = 1 / f

0.5 = 1 / f

∴ f = 1 / 0.5

∴ f = 10 / 5

∴ f = 2

Hope it helps!

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