1.

When a person suffering from problem in vision met a doctor, he wrote in his prescription the following figures. +1.5 D, -2D1. What has the doctor indicated in the prescription?2. Which are the types of lenses prescribed here?

Answer»

1. +1.5 D, -2D indicates the power of lens they required. The power of a lens is defined as the ability of the lens to converge or diverge a beam of light falling on it.

2. The power of a convex lens is positive while the power of a concave lens is negative. +1.5D represents convex lens.

-2D represents concave lens.



Discussion

No Comment Found

Related InterviewSolutions