It is positive because you can look at yourself to see if your pretty or not!(:
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A positive effect is one that is favorable; a negative effect is one that is unfavorable.
Focal length, positive number with a concave mirror, negative for a convex mirror.
Most people would consider it having a negative effect
it has a negative effect cause all things are negative no matter what this is a life answer trust me
-18. Subtracting a positive number has the same effect as adding a negative.