Question

write the rules for the sign convention

Answer 1

1.All distances should be measured from the pole.
2.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.
3.H eight of object and height of image are positive if measured upward from the axis and negative if measured downward.
4. For a concave mirror 'f and ‘R’ are negative and for a convex mirror these are positive.
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Answer 2

while converting the sign you must keep these things in mind:
a) Its universal value should not change
b) It should be universally accepted
c) It sign should has a proper unit eg.(kg,N,m,etc)
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