The distance between an object and a convex lens is changing. It is noticed that the size of the image formed on a screen is decreasing. Is the object moving in a direction towards the lens or away from it?

Explanation

To determine whether the object is moving towards or away from the convex lens based on the observation that the size of the image formed on the screen is decreasing, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Lens Formula**:
The lens formula relates the object distance (u), image distance (v), and focal length (f) of a lens. For a convex lens, the formula is given by:
\[
\frac{1}{f} = \frac{1}{v} - \frac{1}{u}
...