Question

Light travel straight but rainbow is not straight.why?

Answer 1

Rainbows are not just curved, but in fact are circular. The reason for this shape is that rainbows are not fixed objects, but are the result of an optical phenomenon that occurs when sunlight is reflected by water droplets at a specific angle as shown in this cartoon. As the light from the sun passes through the water droplets suspended in the air, because the refractive index of water depends on wavelength, each droplet will effectively act as a small prism, splitting the light into its spectral components 

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Answer 2

bczz rainbow is not as same as light....XD