A person is wearing spectacles with concave lenses for correcting vision. While not using the glasses,
Answers
He cannot see objects beyond 25 cm.
The person who is advised to wear spectacles of concave lenses is suffering from eye defect of
myopia (nearsightedness).
1. A person suffering from myopia can say e nearby objects clearly as the image of a nearby object is formed on the retina, but cannot see distant objects clearly as the image of a distant object is formed in front of the retina instead of on the retina.
2. A concave lens diverges the rays of light passing through it.
3. When spectacles of concave lens of appropriate power are used, the parallel rays coming from a distant object are diverged to proper extent before they are incident on the eye lens.
Therefore, after the converging action of the eye lens, the image of a distant object is formed on the retina of the eye and hence the distant object can be seen clearly.
Hope it helps!