Question

A person cannot see objects beyond 1.2 m distinctly. giving reason name the defect of vision and name the nature of corrective lens.

Answer 1

The distance of far point x = 1.2m
To view distant objects, concave lens of focal length -1.2 should be used.
i.e. f = -x = -1.2m
Power of lens = 1/f = 1/(-1.2m) = -0.83D

To correct this defect of vision, he must use a concave lens. The concave lens will bring the image back to the retina

Answer 2

The distance of far point x = 1.2m

To view distant objects, concave lens of focal length -1.2 should be used.

i.e. f = -x = -1.2m

Power of lens = 1/f = 1/(-1.2m) = -0.83D

To correct this defect of vision, he must use a concave lens. The concave lens will bring the image back to the retina

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