Briefly expain sign convention in mirror and lens

1.	Briefly expain sign convention in mirror and lens
Answer» Sign convention in mirror1.All distance are measure from the pole of the spherical mirror.2.the distance measured in direction of incident of light are taken as positive(+) and the distance measure in opposite to direction is negative(-).3.the height measured upward nd perpendicular to the principal axis of the miŕror are taken as positive.-sc for lens1 aĺl distance are measure with respect to optical centre of lens.2.focal length of convex lens is taken as (+) nd for concave lens be (-).

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