Rainbow is formed because of scattering of all the seven colours of light.
Important Questions on Human Eye and the Colorful World
The following experiment is performed:
Water is taken in a transparent container as shown in the figure. The container is about long. Now, two drops of milk are added to the water in the container. From the left-hand side, a powerful torch is lighted and shown into the water.
One observes that the colour of the milk-water changes with the distance from the torch. The colour will be milky blue near the torch while on the other end, the colour will be orange or red. On adding a few more drops of milk, the colours become darker. With regard to the above experiment, answer the following question:
Which phenomenon of light is illustrated by the experiment?
The following experiment is performed:
Water is taken in a transparent container as shown in the figure. The container is about long. Now, two drops of milk are added to the water in the container. From the left-hand side, a powerful torch is lighted and shown into the water.
One observes that the colour of the milk-water changes with the distance from the torch. The colour will be milky blue near the torch while on the other end, the colour will be orange or red. On adding a few more drops of milk, the colours become darker. With regard to the above experiment, answer the following question:
The suspended particles of milk will scatter more of
Water is taken in a transparent container as shown in the figure. The container is about long. Now, two drops of milk are added to the water in the container. From the left-hand side, a powerful torch is lighted and shown into the water.
One observes that the colour of the milk-water changes with the distance from the torch. The colour will be milky blue near the torch while on the other end, the colour will be orange or red. On adding a few more drops of milk, the colours become darker. With regard to the above experiment, answer the following question:
If you look at the torch face through the liquid from the right side, it will appear
Water is taken in a transparent container as shown in the figure. The container is about long. Now, two drops of milk are added to the water in the container. From the left-hand side, a powerful torch is lighted and shown into the water.
One observes that the colour of the milk-water changes with the distance from the torch. The colour will be milky blue near the torch while on the other end, the colour will be orange or red. On adding a few more drops of milk, the colours become darker.
With regard to the above experiment, answer the following question:
Which atmospheric effect is the experiment closest to?
| Column I | Column II |
| (a) Dispersion | (p) caused due to atmospheric refraction by different layers of air of varying refractive indices |
| (b) Angle of deviation | (q) the phenomenon causing advance sunrise and delayed sunset |
| (c) Atmospheric refraction | (r) refraction of light occurring in atmosphere |
| (d) Scattering of light | (s) angle between the emergent ray and the normal in a prism |
| (e) Twinkling of stars | (t) makes clear sky blue in colour |
| (u) makes sunrise and sunset reddish | |
| (v) none |
