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in the derivation of the formulas of ray optics the cartesian sign conventions are already used even then in solving the numericals of ray optics we have to apply the cartesian sign conventions again,why is it like that?

in the derivation of the formulas of ray optics the cartesian sign conventions are already used even then in solving the numericals of ray optics we have to apply the cartesian sign conventions again,why is it like that?

Grade:12

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