Physics
Grade-10
Easy
Question
The stars appear to twinkle from the Earth’s surface. This is due to ____.
- Reflection of light
- Dispersion of light
- Atmospheric refraction of light
- Internal reflection of light
Hint:
This is due to. frequent absorption of star light by earth's atmosphere.
The correct answer is: Atmospheric refraction of light
The twinkling of a star is due to atmospheric refraction of starlight.
∙ The starlight, on entering the earth’s atmosphere, undergoes refraction continuously before it reaches the earth.
∙ The atmospheric refraction occurs in a medium of gradually changing refractive index.
∙ The apparent position of the star is not stationary but keeps on changing slightly, since the physical conditions of the earth’s atmosphere are not stationary.
∙ As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of starlight entering the eye flickers – the star sometimes appears brighter, and at some other time, fainter, which is the twinkling effect.
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