Question

sign convention for reflection by spherical mirrors​

Answer 1

Here is Your Answer ===========

a) object is always placed to the left of mirror.

b) all distance are measure from the pole of the mirror.

c) distance measured in the direction of the incident ray are positive and the distance measured in the direction opposite to that of the incident ray are negative.

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Answer 2

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♧ The object is always placed to the left of the mirror this implies the light from the object falls on a mirror from the left hand side.

♧ All the distances parallel to the principal axis are measured from the pole of the mirror.

♧ All the distances measured to the right of the origin are taken as positive while others measure to the left of the origin are taken as negative.

♧ Distances measure perpendicular to an app of the principal axis are taken as positive.

♧ Distances measured perpendicular to and below the principal axis are taken as negative.