A beam of light is visible when it is passed through a colloidal solution, but it is not visible when passed through true solution and suspensions. Explain.

Explanation

**Step-by-Step Solution:**

1. **Understanding Light and Matter Interaction**:
- Light behaves differently when it interacts with various types of mixtures. The visibility of a beam of light passing through a solution depends on the size of the particles present in that solution.

2. **Colloidal Solutions**:
- Colloidal solutions contain larger particles (typically in the range of 1 nm to 1000 nm). These particles are large enough to scatter light.
- When a beam of light passes through a colloidal solution, the larger particles scatter the light in different directions. This scattering makes the path of the light beam visible.
...