A person got his eyes tested. The optician's prescription for the spectacles reads: Left eye: $- 3.00 D$ and Right eye: $- 3.50 D$ . The person is having a defect of vision called

Myopia

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Hypermetropia

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Presbyopia

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Astigmatism

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Solution

The correct option is A
Myopia

Power of a lens is inversely proportional to focal length.

$\Rightarrow$ $P = \frac{1}{f}$

If the focal length is negative, the power of the lens will be negative. Therefore, focal length will be negative for a concave lens.

Here, the power of the rectified lens prescribed by the optician is negative, hence it is a concave lens.

A concave lens of appropriate power is used in the rectification of myopia. So, the person is suffering from myopia.

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Similar questions

A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads : Left eye : + 2.50 D Right eye : + 2.00 D (a) State whether these lenses are thicker in the middle or at the edges. (b) Which lens bends the light rays more strongly ? (c) State whether these spectacle lenses will converge light rays or diverge light rays.

Q. A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
(a) State whether these lenses are thicker in the middle or at the edges.
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A person got his eyes tested. The optician's prescription for the spectacles reads: Left eye: −3.00 D and Right eye: −3.50 D. The person is having a defect of vision called

A person got his eyes tested. The optician's prescription for the spectacles reads: Left eye: $- 3.00 D$ and Right eye: $- 3.50 D$ . The person is having a defect of vision called