Question

write singn Convention

Answer 1

Sign Convention for Spherical Mirrors

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

Answer 2

1.Principal axis should along x-axis
2.Object is taken left side of mirror
3.All the distance should be measured for the pole
4.Distance measured in direction of incidentray is taken as positive .
5.Distance measured in opposite direction of incident ray is taken as negative
6.Height measured upwards and perpendicular to principal axis is taken as +ve and vice -vera