The phenomenon of light involved in the formation of shadow is___

Explanation

**Step-by-Step Solution:**

1. **Understanding the Formation of Shadows:**
- Shadows are formed when an object blocks the path of light. When light rays encounter an object, they cannot pass through it, leading to the creation of a shadow behind the object.

2. **Role of Light Rays:**
- When light rays are incident on an object, some rays are absorbed or reflected by the object, while others are blocked completely. The area where the light rays cannot reach is where the shadow is formed.

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