what are the two essential conditions for observing a rainbow?
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Sunlight and rain droplets. Please mark this answers brainlist please
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Light rays enter a raindrop from one direction (typically a straight line from the sun), reflect off the back of the raindrop, and fan out as they leave the raindrop. The light leaving the rainbow is spread over a wide angle, with a maximum intensity at the angles 40.89–42°. (Note: Between 2 and 100% of the light is reflected at each of the three surfaces encountered, depending on the angle of incidence. This diagram only shows the paths relevant to the rainbow.)

White light separates

White light separates
into different colours on entering the raindrop due to dispersion, causing red light to be refracted less than blue light.
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sunlight and droplets
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