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Rainbow is caused by

Q. A rainbow is caused by
 A   Interference
 B   Diffraction
 C   Total internal reflection
 D   Dispersion
Answer:-Total internal reflection
Explanation:  

Most appropriate is C, compared to D. A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicolored arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

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By the use of cold water, how will you separate gilaas (tumbler) stuck together in each other?

Water drops are spherical because of its