By which reason the colour of sky seems blue?

Options

A. due to deflection
B. due to reflection
C. due to refraction
D. due to scattering

Explanation

### Step-by-Step Solution:

1. **Understanding Sunlight**: Sunlight is composed of various colors, which together appear white. Each color has a different wavelength, with blue light having a shorter wavelength compared to other colors.

2. **Interaction with the Atmosphere**: When sunlight enters the Earth's atmosphere, it interacts with particles such as dust and gas molecules present in the air.

3. **Scattering of Light**: The phenomenon that occurs when light encounters small particles is called scattering. This scattering causes the light to spread in different directions.

4. **Wavelength and Scattering**: Among the various colors of light, blue light is scattered more than the other colors because it has a shorter wavelength. This means that blue light is more affected by the small particles in the atmosphere.

5. **Perception of Blue Sky**: As a result of this scattering, when we look up at the sky, we see more blue light being scattered in our direction than any other color. Hence, the sky appears blue to our eyes.

6. **Conclusion**: The reason the color of the sky seems blue is due to the scattering of sunlight by the particles in the Earth's atmosphere, with blue light being scattered the most.

### Final Answer:
The color of the sky seems blue due to scattering.

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