Question

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1Q) What sign conventions are used for reflection from a spherical mirror ?

Answer 1

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 mirrorAll 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.

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Answer 2

all rays should be measured from pole
if the ray is in the direction of incident ray then it is positive.
if the ray is in the opposite direction of incident ray then it is negative.
height of the object and height of the image is upwards then it is positive and if it is downwards then it is negative