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I couldn`t get it.We use sign convention in deriving formulae.Then why again we should use sign convention when solving numericals?

I couldn`t get it.We use sign convention in deriving formulae.Then why again we should use sign convention when solving numericals?

Grade:12

1 Answers

Ansh Arora
21 Points
4 years ago
In the mirror and lens formula that we use, v,u and f is are not distances (of image, object and focus resp.)They are coordinatesHence, in the derivation when you take distances, you have to take modulus of the coordinatesand in the formula, put coordinates

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