Question

mention any four sign conventions​

Answer 1

Answer:

Convention for Spherical Mirror:

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.

Timelike convention.

Particle physics convention.

West coast convention.

Mostly minuses.

Landau–Lifshitz sign convention

Explanation:

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Answer 2

conventions for spherical mirrors.

I. Objects are always placed to the left of the mirror i.e. light must fall on the mirror from left to right.

II. ...

III. ...

IV. ...

V Heights measured perpendicular to and below the principal axis (along negative Y-axis) are taken as negative.