A bird flying high up in air does not cast shadow in the ground because

Options

A. the size of the bird is smaller than sun
B. the size of the bird is smaller than earth
C. light rays fall almost normally on the bird
D. none of the above

Answer

To understand why a bird flying high in the air does not cast a shadow on the ground, we can break down the explanation into a few logical steps:

### Step-by-Step Solution:

1. **Understanding Shadow Formation**:
- A shadow is formed when an object blocks light from a light source. The light source could be the sun, and when it is obstructed by an object, it creates an area of darkness on the ground.

2. **Position of the Bird and the Sun**:
- In this scenario, the bird is flying high in the air, and the sun is positioned above it. The bird is between the sun and the ground.

3. **Size Comparison**:
- The size of the bird is relatively small compared to the size of the sun. The sun is a massive light source, and its rays spread out over a large area.

4. **Effect of Distance**:
- Since the bird is at a significant height, the light rays from the sun that are hitting the bird are also spreading out. As a result, the shadow created by the bird is very small and diffused over a large area on the ground.

5. **Conclusion**:
- Because the shadow of the bird is too small and spread out due to the large size of the sun and the height of the bird, it does not cast a visible shadow on the ground.

### Final Answer:
A bird flying high in the air does not cast a shadow on the ground because the size of the bird is much smaller than the size of the sun, and the light rays from the sun spread out, causing the shadow to be too small and diffuse to be seen on the ground.

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