Question

define and explain sign convention. (it is a long question so give me answer for long question ).

Answer 1

In physics, a sign convention is a choice of the physical significance of signs (plus or minus) for a set of quantities, in a case where the choice of sign is arbitrary. ... In general, a sign convention is a special case of a choice of coordinate system for the case of one dimension.


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Answer 2

I am gonna tell u in short, u can elaborate easily thereafter,

Sign convention are some basic rules which u need to know for image formation. These rules are-
1. Distance between object and mirror is -- u
2. Distance between image and mirror is ---v
3. Distance between focus and pole is --- f
4. If the image is formed above the principal axis,then the image formed is in positive otherwise negative.
5.The 'u' is always represented by
Negative.
6. 'v' is negative if it lies on the left side otherwise positive.
7. There is also a formula which is,
----. 1/u + 1/v = 1/f




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