Question

Aniket from Std. X uses spectacles. The power of the lenses in hisspectacles 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

1) Concave Lens is used in Spectacles.
2)The defect of vision Aniket is suffering from is Myopia i.e. near sightedness .
3)P = -0.5
Power of lens = 1 / Focal length -----[Formula]
Focal Length =1 / Power of lens
=1 / -0.5
= -2 metres
The focal length of lense used in spectacles is -2


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Answer 2

Answer:

1. Aniket uses concave lens because the power of the lens is in negative.

2. He is suffering from Myopia because he is using concave lens

Explanation:

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