Question

From which point of lens all the distances are measured

Answer 1

Answer:

All distances are measured from the Optical Centre(O)of a lens

Explanation:

Answer 2

Answer:

all the distances are measured from the optical center of the lens.

Explanation:

* lensea are of two types

1. concave lens

2. convex lens

* Power of lens = 1/ focal length

si unit of power is dioptre ( D).