Why do we use sign convention twice? | Ray optics | Physics | Khan Academy

We use sign convention once in derivation, and once while solving problems. Why do we use it twice? Let's understand that in this video!

00:00 Introduction
00:28 Deriving mirror equation for a concave mirror
04:21 Deriving mirror equation for a convex mirror
08:59 Different equations for different cases
09:28 Applying sign convention once
11:01 Benefit of using sign convention once
11:28 Applying sign convention the second time
13:31 Same goes for lenses

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