Question

Aniket from standard 10 uses spectacles the power of the lens spectacles is - 0.5D answer the following questions
a) state the type of lenses used in spectacles
b) name the defect of vision Aniket is suffering from find
c) find the focal length of lenses used in spectacles ​

Answer 1

a) Concave lens
b) Myopia
c) f=1/P
=1/-0.5
=-2
Ans-Focal length is 2 meter....


hope it helps^_^

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

0.5 = 1 / f

∴ f = 1 / 0.5

∴ f = 10 / 5

∴ f = 2

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Hope it helps!

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