Procedure:
Research work to be conducted on:
· How are the rainbows formed?
· Why are the rainbows shaped like an arc?
· Why is a rainbow called a rainbow?
· Why are there sometimes two rainbows?
· Why is the order of colors reverse in a secondary rainbow?
· Can you see a rainbow at night?
· What is the antisolar point?
· Tabulate all the colors of a rainbow according to the increasing order of their frequency.
Answers
Answer:
A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors. When light exits the droplet, it makes a rainbow..
If we draw rays of sunlight that reflect at 42 degrees into your eyes then those rays start to look like they form a circular arc in the sky. So the reflection gives you the shape of the rainbow, while the refraction gives you the colours of the rainbow.
Often you can see a second rainbow above a brighter one. This is caused by extra reflection inside the raindrops. Since the secondary rainbow is formed from two reflections instead of one, it has a wider radius than the first rainbow and its colors are reversed.
The color sequence of the secondary rainbow is opposite to the primary; red is on the inside of the arc and violet on the outside. ... This separation happens because different colors bend, or refract, by different amounts. The shortest (blue and violet) wavelengths refract the most; red light refracts the least.
The moon is the key, just as sunlight produces rainbows during the day, moonlight can produce rainbows at night. This is a lunar rainbow or 'moonbow'. ... Moonbows are rare because moonlight is not very bright.
The antisolar point is the abstract point on the celestial sphere directly opposite the Sun from an observer's perspective. ... On a sunny day, the antisolar point can be easily found; it is located within the shadow of the observer's head.
Hope you liked my answer.