Answer true or false
Penumbra is a region of partial darkncss.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks whether the statement "Penumbra is a region of partial darkness" is true or false.

2. **Defining Penumbra**: Penumbra is defined as the area surrounding the complete shadow (umbra) where the light is partially blocked. This occurs when an object obstructs a light source, creating a gradient of light intensity.

3. **Analyzing Light Sources**: When a point light source is present, it creates a sharp shadow. However, with a larger light source, the shadow is not as well-defined, resulting in areas of varying light intensity.

...