1.

A near sighted man cannot see objects clearly up to a distance of 1-5m. Calculate the power of the lens ofthe spectacles necessary for the remedy of this defect.3.

Answer»

The distance of far point x = 1.5mTo view distant objects, concave lens of focal length -1.5 should be used.i.e. f = -x = -1.5mPower of lens = 1/f = 1/(-1.5m) = -0.666D

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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