In the layer of the atmosphere, there is a great deal of dust. When the weather is fine, it is possible to see the magnificent red colour of the setting sun. what have these observation to do with colloids?

In the lower layer of the atmosphere, there is great deal of dust. When the weather is fine, it is possible to see the magnificent red colour of the setting sun. What have these observation to do with colloids ?

A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere. (a) What does the student mean by saying that the sun can be see after it has set ? (b) Do you think that the students' conclusion is correct ?

The sky was already full of rusting wings. But when Jean stepped into the still lusterless water, he seemed to be swimming in an indeterminate darkness until he saw the streaks of red and gold over the horizon. Then he suddenly swam back to land and clambered up the winding path to his house. After a great deal of panting he reached a little gate, pushed it open and climbed a stairway. The house above the world had its huge bay-windows through which one could see the horion from one edge to the other. Here, no one complained of exhaustion. Every one had his joy to conquer, every day. What do the words "great deal of panting" imply ? 1. Jean was too weak to walk 2. Jean's house was on a hill 3. Jean was too tired to walk after swimming 4. Jean's house was too far away from the shore Which of the statements given above is/are correct ?