Question

Sign convention for reflection by spherical mirrors

Answer 1

for concave mirror:

-f

-r

-u

+h(object)

-h(image)

-v

for convex mirror:

+f

+r

-u

+h(object)

+h(image)

+v

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Answer 2

Answer:

The description about the sign convention for reflection by spherical mirrors is as follows :

• The object is always placed to the left of the mirror.
• The light on the object falls 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.
• All the distances measured to the left of the origin are taken as negative.
• All the distances measured perpendicular to and above the principal axis are positive.
• All the distances are measured perpendicular to and below the principal axis are negative.