Question

Aniket from std 10th uses spectacles. The power of the lenses in his spectacles is -0.5 D.

ANSWER THE FOLLOWING QUESTION:
(a) State the type of lenses used in his spectacles.
(b) Name the defect of vision Aniket is suffering from.
(c) Find the focal length of the lenses used in his spectacles.

Answer 1

a) concave lens (-)
b) myopia
c)
$\frac{1}{0.5} = 2$
f = 1 upon 0.5 by dividing the answer will be
f = 2

Answer 2

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

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

$\large\boxed{\fcolorbox{blue}{yellow} {See the attachment }}$

Hope it helps!

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