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  • Name the type of defect of vision a person is suffering from, if he uses convex lenses in his spectacles for the correction of his vision. If the power of the lenses is +0.5D, find the focal length

Name the type of defect of vision a person is suffering from, if he uses convex lenses in his spectacles for the correction of his vision. If the power of the lenses is +0.5D, find the focal length of the lenses. 

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Type of defect- Hypermetropia. It occurs when the eye is too short, and the image is formed behind the retina. Convex lenses help by converging the light rays before they enter the eye, bringing the image onto the retina.

$\text{Given: Power of the lens } P = +0.5\text{D} $
$\text{Focal length: } f = \frac{1}{P} = \frac{1}{0.5} = 2\,\text{meters}.$

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Saniya Khatri

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