Question

Ankit from Standard 10th uses spectacles the power of lens in his spectacles is -0.5 D answer the following questions state the types of lens used in his spectacles B name the defect of the vision Ankit is suffering from c find the focal length of the lens used in spectacles

Answer 1

The type of lens used in his spectacles is a concave lens.

The defect of vision from which he is suffering is Myopia or Nearsightedness.


Hope this 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 (m)

0.5 = 1 / f

∴ f = 1 / 0.5

∴ f = 10 / 5

∴ f = 2 m

Hope it helps!

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