Question

Explain the sign of convention for reflection in sperical mirror

Answer 1

Sign Convention for Spherical Mirror: ... Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis. This means sign is always taken as – (negative) in front of a spherical mirror.

Answer 2

I will give my answer by sending the photo of the diagram and the explanation, I will give below .

The object is always placed on the left of the lens ,all distance parallel to the principal Axes are measured from the optical centre

The distance measure to the right of optical Centre are taken to be positive while those measured to the left are taken to be negative

Distance perpendicular to the principal axis and about it are taken to be positive

Distance perpendicular to the principal axis and below it are taken to be negative

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

I hope the answer is correct.