Question

Aniket from Std. X

uses spectacles. The power of

the lenses in his

spectacles is -0.5 dioptre.

Answer the following questions :

(i)State the type of lenses used

in his spectacles.(ii)Name the

defect of vision Aniket is

suffering from.

(iii)Find the focal length of the

lenses used in his spectales.

Answer 1

Concave lens, hypermetropia

Answer 2

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

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

concave lens as the power of the lens is negative.

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

iii) 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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