Question

what are the sign convention for the parameters related to the mirror equation?

Answer 1

The following sign convention are followed
...all distances are to be measured from the pole (p) of the mirror
...the distances in the direction of light are taken positive while the distances opposite to the direction of light are taken as negative
...the distances above the principal axis are taken positive while those below the principal axis are taken negative


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Answer 2

Answer:

All distance should be measured from the Pole