Question

Surabhi from std. X uses spectacle. The power of the lenses in
spectacle is 0.5 D.
Answer the following questions from the given information
(a)Identify the type of lenses used in her spectacle.

(b)Identify the defect of vision Surabhi is suffering from.

(c)Find the focal length of the lenses used in her spectacle.​

Answer 1

Answer:

1. convex lens

2. hypermetropia

3.1/f=1/u-1/v

Answer 2

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

convex lens as the power of the lens is positive .

b) The defect of vision Surabhi 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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