Determine how far an object must be placed in front of a converging lens of focal length 10 cm in order to produce an erect (upright) image of linear magnification 4.

Explanation

To solve the problem of determining how far an object must be placed in front of a converging lens of focal length 10 cm to produce an erect image with a linear magnification of 4, we can follow these steps:

### Step 1: Understand the relationship between object distance (u), image distance (v), and focal length (f).
The lens formula relates these quantities:
\[ \frac{1}{f} = \frac{1}{v} - \frac{1}{u} \]
Where:
...