Question

The far point of a myopic person is 140 CM in front of the eye. The focal length of the lens required to enable him to see distant object clearly is???

Answer 1

Power of lens = 0.66 D

Explanation:

Given: Far point of the myopic person = 150 cm.

So in order for the person to clearly see an object, the image should be formed at 150 cm in front of his eye.

By lens formula, we know that 1/f = 1/v - 1/u

1/f = -1/150 - 1/infinity

So it implies that f = -150 cm

Power of the lens required to correct his vision = 1/f = 1/-150 cm = 1/-1.5m = 0.66 D

Answer 2

Answer:

The focal length of the lens required is -140cm.