Question:

We can see the sun even when it is a little below the horizon because of ..........................................

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Atmospheric refraction causes the apparent shift in the position of celestial objects. It is the reason why the sun appears to rise earlier and set later than its actual geometric position.
  • Reflection of light
  • Refraction of light
  • Dispersion of light
  • Absorption of light
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The Correct Option is B

Solution and Explanation

Step 1: Understanding atmospheric refraction
The phenomenon responsible for seeing the sun even when it is below the horizon is atmospheric refraction. The Earth's atmosphere consists of multiple layers of air with varying densities. Step 2: How refraction causes the effect
When light from the sun enters the Earth's atmosphere, it bends due to the change in the optical density of air layers. This refraction makes the sun appear higher than its actual position, allowing us to see it even when it is geometrically below the horizon. Step 3: Evaluating the given options
- Reflection of light occurs when light bounces off a surface, which is not responsible for this phenomenon.
- Refraction of light is the correct answer since bending of light in the atmosphere causes the effect.
- Dispersion of light refers to the splitting of white light into different colors, which is not relevant here.
- Absorption of light refers to the process in which light energy is absorbed and converted to heat, which is also incorrect.
Thus, the correct answer is \(\mathbf{Refraction \ of \ light}\).
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