Question

what is logic behind sign convection for spherical mirror . Don't tell me what is sign convection or its rule

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Answer 1

Answer:

This sign convention is known as New Cartesian Sign Convention. Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis.

Answer 2

Answer:

Sign is taken as + (positive) behind the spherical mirror. For example if an image is formed behind the mirror, the distance of image is taken as + (positive) from pole along the principal axis.

The height of is taken as + (positive) above the principal axis and taken as – (negative) below the principal axis.

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. For example; the distance of object is always taken as – (negative) in case of both types of spherical mirror, i.e. concave and convex mirrors.