both a and r are true and r is correct explanation of a
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A rainbow occurs when light hits the water drops in the atmosphere at a certain angle. It is an atmospheric phenomenon that is formed through optical processes such as refraction, dispersion, internal reflection and secondary refraction.
If the light source is the sun, then the rainbow will be colorful and bright. As shown in Fig. when a beam of sunlight enters the water drop the degree of refraction of the different colors is variable. Violet light has the shortest wavelength therefore, its degree of refraction is also the greatest; red light has a longer wavelength therefore its degree of refraction is the smallest. The degrees of refraction of the other colors lie within this range.
Therefore, a solar halo with violet light in the innermost and red at the outermost edge is formed, and that's why the rainbow we see is always violet on the inside and red on the outside. The visual angle (the angle from the ground surface to the vertex of the rainbow) is about 42
A secondary rainbow is different from a primary rainbow only in that it is formed by secondary reflection of light within the raindrops. Therefore, when we see the light reflected by the raindrops the spectrum of the light is the exact opposite from that of a primary rainbow, which means the secondary rainbow is red on the inside and violet on the outside. It has a visual angle of about 50
and is concentric with the primary rainbow.
Rainbow is a meteorological phenomenon that is caused by reflection ,refraction and dispersion of light in water droplets
This is caused by light being reflected twice on the inside of the droplet before leaving it
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bahut both assertion and reason are true . reason is the correct explanation for assertion
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Question:-Clouds formation in the sky is physical or chemical change
ANS:- Physical change
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