Question

State the sign conventions used for the reflection from 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 mirror
All 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

1. Anything above the principal axis is positive and anything below the principal axis is negative
2. for a concave mirror 
u=-ve 
v=+ve (virtual)
=-ve(real) 
ho=+ve
hi=+ve (virtual)
-ve(real)