Question

write the rules of sign convention​..

Answer 1

Answer:

in optics sign convention is taken as according to direction of light

in direction of light sign is positive

but in opposite direction sign is negative

above the principle axis sign is positive for measuring size of object and image.

if we measured size from principle to down then sign is negative

bye

Answer 2

Rules for sign convention :

All distances should be measured from the pole.

The distances measured in the direction of incident light, to be taken positive and measured in the opposite direction of incident light to be taken negative.

Height of object and height of image are positive if measured upward from the axis and negative if measured downward.

For a concave mirror 'f and ‘R’ are negative and for a convex mirror these are positive.