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Refraction observed in the atmosphere....

Refraction observed in the atmosphere.

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When a ray of light passes obliquely from an optically rarer medium to an optically denser medium, it bends towards the normal at the point of incidence. If opposite is the case, the ray bends away from the normal.
Atmosphere is never static. Air is mobile and its density and temperature are not uniform. As a result, in general , the path of a ray of light through atmosphere of varying refractive index is a curve. The refractive index of cool air is greater than that of hot air.
Atmospheric refraction of light results in many intersecting optical phenomena such as twinkling of a star, advanced sunrise and delayed sunset, mirage and flickering of an object seen through a turbulent stream of hot air rising from a fire.
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How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?

What is the correct reason for blinking // flickering of stars ? Explain it. a. The blasts in the stars. b. Absorption of star light by the atmosphere. c. Motion of the stars. d. Changing refractive index of gases in the atmosphere.

Assertion (A): On a clear summer night twinkling of stars is observed. Reason (R) : The twinkling of stars is caused by dispersion of star light by the atmosphere.

Assertion : The rainbow is an example of the dispersion of sunlight by the water drops in the atmosphere. Reason : No reflection or refraction of light is involved in the formation of rainbow.

Assertion :- The twinkling of stars is due to the fact that refractive index of the earth's atmosphere fluctuates. Reason :- In cold countries, the phenomenon of looming (i.e ship appears in the sky) takes place, because refractive index of air decreases with height.

Name two effects produced by the atmospheric refraction.

We know that light refracts (or bends) when it goes from one medium to another. Now, the atmosphere contains only air. Then how does light get refracted on passing through only air in the atmosphere ?

Atmospheric Refraction|Reason Of Atmospheric Refraction|Phenomena In Nature|Twinkling Of Stars|Stars Twinkle At Night But Planets Do Not Twinkle At All. Why?|Stars Seem Higher Than They Actually Are|Questions|Home Work|Summary

NAVNEET PUBLICATION - MAHARASHTRA BOARD-REFRANCTION OF LIGHT -WRITE SHORT NOTES
  1. Refraction observed in the atmosphere.

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  2. Dispersion of light

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