Space is mostly vacuum, devoid of any medium. What colour does the Sun appear to the astronauts on International Space Station? Give reasons for your answer.
Important Questions on The Human Eye and the Colourful World
Now, consider a situation in which the near point of a defective eye is at a distance of . Assuming the near point of a normal eye to be , answer the following question:
If one wishes to reduce the near point of this eye to by using a lens, what will be its power?
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
Reema and her family were travelling to her grandmother's home. They started in the morning. While travelling through the city she observed the traffic signals. She noted down the traffic lights based on their colour and meaning.
| Colour | Indicate |
| Red | Stop |
| Yellow | Wait |
| Green | Go |
She thought about the reasons for choosing these colours and discussed them with her parents. She noticed that even at night, the red colour can be easily seen from a distance.
This is because red is
A beam of white light falling on a glass prism gets split up into seven colours marked to as shown m the diagram.
Which two positions correspond closely to the
