1.

Explain in brief the reason for each of the following : (a) Advanced sun-rise (b) Delayed sun-set (c) Twinkling of stars

Answer»

IT IS BECAUSE OF REFRACTION.In physics, refraction is the change in direction of a wave PASSING from one MEDIUM to another or from a gradual change in the medium. Refraction of light is the most COMMONLY observed phenomenon, but other WAVES such as sound waves and water waves also EXPERIENCE refraction. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation relative to the direction of change in speed.



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