Question

Aniket from Standard 10th uses spectacles the power of the lens is in his spectacles is minus 0.5 D.


answer the following questions .

a ) state the type of lenses used in spectacles

B) name the defect of vision Aniket is suffering from

c)find the focal length of the lens is used in his spectacles....


please tell it is urgent

Answer 1

a) Aniket is using a diverging lens which is concave lens.

b) Aniket is suffering from Myopia.

c) Focal length of lens would be:

D=1/F

0.5=1/F

F= 2

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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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