Physics
Grade-10
Easy
Question
The apparent position of a star is slightly raised w.r.t. its actual position. This is due to _____.
- Reflection of light through water
- Refraction of light through water
- Reflection of light through atmosphere
- Refraction of light through atmosphere
Hint:
Due to atmospheric refraction, the stars seem to be higher in the sky than they actually are.
The correct answer is: Refraction of light through atmosphere
Due to atmospheric refraction, the stars seem to be higher in the sky than they actually are. This can be explained as follows : Light from a star is refracted (bent) as it leaves space (a vacuum) and enters the earth's atmosphere. Air higher up in the sky is rarer but that nearer the earth's surface is denser.
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