Question

Anket from std. 10 usese spectacles . The power of the lens in his spectacles is -0.5 D 1) state the types of lens used in his spectacles

Answer 1

Concave lens used in his spectacle

Answer 2

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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 (m)

0.5 = 1 / f

∴ f = 1 / 0.5

∴ f = 10 / 5

∴ f = 2 m

Hope it helps!

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