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# What is the difference between formula of lens and mirror?

Let $v$ is the position of the **image** from the **mirror** or **lens**.

$u$ is the position of the object from the mirror or lens.

$f$ is the focal length of the mirror or lens.

**Mirror formula**: $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$

**Lens formula**: $\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

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