The focal length of a concave mirror is `30`cm.Find the position of the object in front of the mirror,so that the image is three times the size of the objects.

Explanation

To solve the problem, we need to find the position of the object in front of a concave mirror such that the image formed is three times the size of the object. Given the focal length of the concave mirror is 30 cm, we can follow these steps:

### Step 1: Understand the Magnification Formula
The magnification (m) of a mirror is given by the formula:
\[ m = -\frac{v}{u} \]
where:
- \( v \) = distance of the image from the mirror
- \( u \) = distance of the object from the mirror
...