Question

State the sign convention for lenses.
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Answer 1

$\bold{Please\:mark \:me\:Birlianist}$

Answer 2

Answer:

1. Object always should be placed at left of the lens. All distances parallel to principal axis are measured from the optical centre (O)

2. The distanced measured to the right of O are taken to be positive whole those measured to the left ata taken to be negative.

3. Distances perpendicular to the principal axis and above it are taken to be positive.

4. Distances perpendicular to the principal axis and below or are taken to be negative.

5. The focal length of a convex lens is positive while that of a concave lens is negative.