What is a Rainbow? - Light Refraction

The video explains how rainbows form, requiring sunlight at a low angle and water droplets. Light slows and bends when entering water, a process called refraction. Inside the droplet, light reflects and refracts again, splitting into colors due to different wavelengths. This creates a spectrum visible as a rainbow arc. The angle of refraction makes rainbows appear distant and unreachable.

What are the two main conditions required to see a rainbow?

• The sun must be setting and the air must be dry.

• The sun must be high in the sky and there must be no clouds.

• The sun must be shining at a low angle and there must be water droplets in the air.

• The sun must be directly overhead and the sky must be clear.

What happens to light when it passes from air to water?

• It speeds up and travels in a straight line.

• It slows down and bends, a process known as refraction.

• It changes color and becomes invisible.

• It reflects back into the air without bending.

Why do the colors of the spectrum split when light passes through a raindrop?

• Because the raindrop absorbs some colors and reflects others.

• Because each color has a different wavelength, causing them to bend differently.

• Because each color has the same wavelength.

• Because the light is too weak to maintain its original color.

At what range of angles does sunlight leave a water droplet to form a rainbow?

• Between 40 and 42 degrees.

• Between 50 and 55 degrees.

• Between 60 and 65 degrees.

• Between 30 and 35 degrees.

Why is it impossible to get closer to a rainbow?

• Because rainbows disappear when you get too close.

• Because rainbows are only visible from a distance.

• Because the rainbow moves away as you approach it.

• Because the illusion is recreated by new raindrops as you move.