I understand how rainbows are formed. Light reflecting on raindrops (that act like prisms). Shouldn’t that always happen if it rains?
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Rainbows are not actually all that rare, and it is possible to see a rainbow any time it is raining and the sun is shining at the same time. However, rainbows are often not very bright or distinct, and they may be hard to see if the sun is not at the right angle or if the rain is not heavy enough.
To see a rainbow, you need a combination of rain, sunlight, and the right viewing angle. When sunlight hits a raindrop, it is refracted (bent) as it passes through the raindrop and then reflected off the back of the raindrop. This causes the sunlight to be separated into its different colors, creating a spectrum of colors that appears as a rainbow.
To see the rainbow, you need to be standing in the right place, with the sun behind you and the rain in front of you. If the sun is too low in the sky, the rainbow will appear too close to the ground to be seen. If the rain is not heavy enough, the rainbow will not be very bright.
In addition, rainbows are often only visible for a short period of time, because the sun and the rain are constantly moving. This means that if you want to see a rainbow, you may need to be in the right place at the right time.
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