Question

When the sun and moon are near the horizon, we notice that they are distorted from a circular form into ovals, and are usually of a reddish colour. The former effect is due to the fact that the amount of refraction changes rapidly near the horizon, being greater below than above. Thus the lower edges of these bodies are raised more than the upper ones, so that the vertical diameter is diminished. The horizontal diameter is not affected, and so the sun and moon appear to be oval and not circular. Their reddish colour is due to absorption. White light is composed of all the “colours of the rainbow” —red, yellow, green, blue, violet, etc., —and of these, the green, blue, and violet (the shorter “waves”) are more readily absorbed by the atmosphere, or rather its vapours (for pure dry air exercises scarcely any absorption), than the red and yellowish rays (which are longer).
THUS THIS PROCESS OF SELECTIVE ABSORPTION RESULTS IN THE LOSS OF A GREATER AMOUNT OF THE BLUE AND VIOLET RAYS, AND SO THE SUN AND MOON, WHEN SEEN LOW DOWN NEAR THE HORIZON, APPEAR REDDISH OR YELLOWISH RATHER THAN WHITE, an effect seen also when the sun shines through a “November fog.”

The sentence (or section) in ALL CAPS is an example of the main idea.
True
False

Answer 1

The correct answer to this question is: TRUE.

The section written in all caps is a conclusion of the previous explanation, therefore, it expresses the main idea in the text. A conclusion consists of a recapitulation of the introduction, which usually expresses the main idea in a text. The first sentence wrote, "When the sun and moon are near the horizon, we notice that they are distorted from a circular form into ovals, and are usually of a reddish color" tells the reader what is the main information or idea the writer is trying to convey. All that follows is an explanation of the reasons why that phenomenon happens. In the end, the section written in all caps resumes the introduction and adds a summary of the information given. Thus, this section can be considered an example of the main idea presented in the beginning.