Question

Why rainbow is in the shape of Arc . Explain

Answer 1

Hloo dear..!!!

The reason why the rainbow appears in shape of arc is becoz of it having the set of all points in the sky that make the same angle between you, the water droplets, and the sun.

Answer 2

The amount light bends as it passes through the droplet depends on the light's wavelength, or color -- red light bends the most, orange and yellow slightly less, and so on, down to violet, which bends the least.

Since each color is bent through a specific angle -- red light comes from the sun and is reflected back at an angle 42 degrees away from its original direction, while blue light bends only 40 degrees -- each color appears at a different place in the sky. Red, say,
denotes all those locations in the sky 42 degrees away from an imaginary line connecting the sun to the back
of your head. Together, these places trace out an arch. Since blue appears only 40 degrees from this imaginary line (which also connects your head to its shadow), the blue arch of a rainbow
is always below the red.