Calculate focal length of a spherical mirror from the following observations : object distance, `u = (50.1 +- 0.5)cm` and image distance , `upsilon = (20.1 +- 0.2)cm.`

Explanation

To calculate the focal length of a spherical mirror using the given object distance \( u \) and image distance \( v \), we will follow these steps:

### Step 1: Write down the formula for focal length
The formula for the focal length \( f \) of a spherical mirror is given by:
\[ \frac{1}{f} = \frac{1}{u} + \frac{1}{v} \]

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