In case of a concave mirror magnification is found to be `m_(1) = -0.5` for a certain position of object and when object is displaced by 5 cm from this position then magnification is found to be `m_(2) = -0.25`. What will be the focal length of the mirror?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the given data
We have two positions of the object with their respective magnifications:
- For the first position, \( m_1 = -0.5 \)
- For the second position, \( m_2 = -0.25 \)
- The object is displaced by \( 5 \, \text{cm} \).

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