Question

What sign conventions are used for reflection from a spherical mirror?​

Answer 1

Answer:

Distances along the direction of the incident ray (along positive x- axis) are taken as positive, while distances along the direction of the reflected ray (along negative x-axis) are taken as negative.

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Answer 2

$\huge\pink{Answer}$

According to the Cartesian sign convention, the pole of the mirror is taken as the origin. The principal axis is taken as the X-axis of the frame of reference. The sign conventions are as follows:

$\sf\blue\bigstar$ The object is always kept on the left of the mirror. All distances parallel to the principal axis are measured from the pole of the mirror.

$\sf\blue\bigstar$ All distances measured towards the right of the pole are taken to be positive, while those measured towards the left are taken to be negative.

$\sf\blue\bigstar$ Distance measured vertically upwards from the principal axis are taken to be positive.

$\sf\blue\bigstar$ Distance measured vertically downwards from the principal axis are taken to be negative.

$\sf\blue\bigstar$ The focal length of a concave mirror is negative while that of a convex mirror is positive.