Question

what are the sign convention used in mirror??​

Answer 1

HEY MATE!

HERE IS YOUR ANSWER:

If th focal lenght, object or image is infront of mirror it is negative, if they are behind the mirror it is positive.

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Answer 2

The following sign convention is used for measuring various distances in the ray diagrams of spherical mirrors:

• Object is always placed to the left of mirror
• All distances are measured from the pole of the mirror.
• Distances measured in the direction of the incident ray are positive and the distances measured in the direction opposite to that of the incident rays are negative.
• Distances measured along y-axis above the principal axis are positive and that measured along y-axis below the principal axis are negative.