Question

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropia eye is 1m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

Answer 1

The hypermetropic eye is corrected by using a convex lens of appropriate focal length as spectacles in front of the eye. This convex lens makes a virtual image at the position of near point of the person so that the person is now able to see that image clearly.

Thus, the convex lens of focal length +33.3 cm is required to correct this defect.​

Thus, the convex lens of power +3.0 D is required.​