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The formula for linear magnification of a spherical mirror is `m=(h_(2))/(h_(1))= (-v)/(u)`. What determines the sign of m? What is the signification of the sign?

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In the formula, `m=(h_(2))/(h_(1))=(-v)/(u)`, the sign of m is determined by the signs of `h_(1)` and `h_(2)`. When m is positive, the image is virtual and erect. When m is negative, the image is real and inverted.

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