Question

(a) Is it correct to say that only red colour is given out from the water droplets situated on the outer edge of a rainbow? Justify your answer.
(b) Write a situation in which a rainbow can be viewed as a full circle instead of an arc.

Answer 1

Hint : To know about the given statement, we should go through the whole concept of the Rainbow, the formation of the rainbow, the different types of the rainbow and also why rainbow is formed after rain mostly.

Complete Step By Step Answer:
(a) Yes, only red colour is given out from the water droplets situated on the outer edge of a rainbow because the outer edge of the rainbow is of the Red colour. And, as we all know the wavelength of the red colour is maximum among all the colours. That’s why we can see only the red colour at the outer edge of a rainbow.
A rainbow is formed when light (generally sunlight) passes through water droplets hanging in the atmosphere. The light waves change direction as they pass through the water droplets, resulting in two processes: reflection and refraction. At the point when light reflects off a water drop, it essentially bobs back the other way from where it began. At the point when light refracts, it takes an alternate bearing. A few people allude to refracted light as "bowed light waves." A rainbow is shaped on the grounds that white light enters the water bead, where it twists in a few unique ways. At the point when these bowed light waves arrive at the opposite side of the water bead, they reflect back out of the drop rather than totally navigating the water. Since the white light is isolated within the water, the refracted light shows up as discrete tones to the natural eye.
(b) Full-circle Rainbow is also a type of rainbow. In theory, every rainbow is a circle, but from the ground, usually only its upper half can be seen. Since the rainbow's centre is diametrically opposed to the Sun's position in the sky, more of the circle comes into view as the sun approaches the horizon, meaning that the largest section of the circle normally seen is about $50\%$ during sunset or sunrise. Reviewing the rainbow's lower half requires the presence of water beads beneath the onlooker's viewpoint, just as daylight that can contact them. These necessities are not normally met when the watcher is at ground level, either in light of the fact that drops are missing in the necessary position, or on the grounds that the daylight is discouraged by the scene behind the spectator. From a high perspective like a high structure or an airplane, nonetheless, the necessities can be met and the round trip rainbow can be seen. Like a halfway rainbow, the roundabout rainbow can have an optional bow or effusive withdrawals from. It is conceivable to create the round trip when remaining on the ground, for instance by showering a water fog from a nursery hose while confronting away from the sun.
A round rainbow ought not be mistaken for the magnificence, which is a lot more modest in breadth and is made by various optical cycles. In the correct conditions, a wonder and a (roundabout) rainbow or mist bow can happen together. Another barometrical wonder that might be confused with a "round rainbow" is the ${22^\circ }$ corona, which is brought about by ice gems instead of fluid water drops, and is situated around the Sun (or Moon), not inverse it.

Note :
People think that the rainbow is magical but unfortunately it’s scientifically formed. The rainbow is very unique because it’s formed from the geometry of raindrops. Their colours come from raindrops that reflect sunlight, breaking white sunlight into colours but there is more to just raindrops and colours.