Shadows consist of two portions, the umbra and the penumbra. Which statement below applies ONLY to the umbra?

Options

A. It receives no light from any part of the source
B. It receives light from part of the source
C. it is a partial shadow
D. It is circular in shape

Explanation

To solve the question regarding the characteristics of the umbra and penumbra in shadows, we can break down the analysis into clear steps:

### Step-by-Step Solution:

1. **Understanding Shadows**:
- Shadows are formed when an opaque object blocks light from a light source. They consist of two main parts: the umbra and the penumbra.

2. **Defining the Umbra**:
- The umbra is the innermost part of the shadow where the light source is completely blocked. In this region, no light from the source reaches.

3. **Defining the Penumbra**:
- The penumbra is the outer part of the shadow where only a portion of the light source is blocked. In this region, some light can still enter, resulting in a partial shadow.

4. **Characteristics of the Umbra**:
- The umbra is completely dark because no light can enter this region. It is a region of total shadow.

5. **Characteristics of the Penumbra**:
- The penumbra, in contrast, is a region of partial shadow where some light is still present.

6. **Analyzing the Options**:
- The question asks for a statement that applies only to the umbra.
- The correct statement is that the umbra receives no light from any part of the source, which distinguishes it from the penumbra.

7. **Conclusion**:
- Therefore, the statement that applies only to the umbra is: "It receives no light from any part of the source."

### Final Answer:
The statement that applies ONLY to the umbra is: **"It receives no light from any part of the source."**

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