Atmospheric Refraction | Class 10 Physics |
ฝัง
- เผยแพร่เมื่อ 26 ส.ค. 2024
- Atmospheric refraction is a phenomenon in physics where light passing through the Earth's atmosphere bends due to variations in air density. This bending occurs because the speed of light changes as it moves through different mediums, such as air at different temperatures and densities.
Causes: The main cause of atmospheric refraction is the variation in the density of air with altitude, which affects the speed of light passing through it. Warmer air is less dense, causing light to travel faster, while cooler air is denser, causing slower light transmission.
Effects on Appearance: Atmospheric refraction is responsible for several optical illusions, such as the apparent sunrise and sunset times. The Sun appears to rise a few minutes earlier and set a few minutes later than it would if there were no atmosphere.
Twinkling of Stars: Stars appear to twinkle due to atmospheric refraction. As starlight passes through different layers of the atmosphere with varying densities, its path bends slightly, causing the apparent brightness to fluctuate.
Applications: Atmospheric refraction has practical applications in fields such as astronomy, where accurate calculations of celestial positions require accounting for the bending of light by the atmosphere.
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