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Light rays from the stars travel through layers of air of varying densities. These
rays are continuously refracted and bend towards the normal as the refraction
occurs from a rarer to a denser medium. The density of the layers of air changes as
a result of air movement and convection currents. As a result, the position of the
star's image changes after every short interval. The varying positions of the images
formed at short intervals of time create the illusion that the star is twinkling.
Variation in the Size of the Sun
Class X Science www.vedantu.com 48
