Question
Tue January 29, 2013 By:

Can u please tell me the sign conventions for concave and convex mirrors and lenses

Expert Reply
Tue January 29, 2013
In lenses and mirrors we take the following directions as positive:
 
1. When we move from pole/center in the direction of incident light
2. When we move in the verticle up direction from the principle axis
 
and following directions as negative:
 
1. When we move opposite to the direction of incident light
2. When we move downwards from the priciple axis.
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