Question

how to learn sign conventions of spherical lenses

Answer 1

Hey buddy

Here is ur answer

Concave lense have every thing negative

But Convex lens has every thing positive except Distance of object(u)

Hope this will Help u

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Answer 2

Sign conventions:

Concave lense.

u = negative

f = negative

v = negative
_________________Convex
f= positive

u= negative

v = positive