Question

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

Answer 1

1. Aniket uses concave lens in his spectacles

2. Aniket is suffering form Myopia or near sightedness

3. Power=1/focal length

-0.5 = 1/f

f = 1/-0.5

f = -2 m

Hope it helps you

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!

$<marquee> Mark as brainliest ✔️</marquee>$