Explain why the planets do not twinkle.
As in the stars, they twinkles due the apparent position (which is not a fixed position) cause the light travels from the stars is refracted through the atmosphere. Planets do not twinkle because they are very much closer to the earth in the comparison of stars and appear large to the human eyes. Thus, the planet can be seen as extended sources. When the light ray come to our eyes from all the individual extended sources are constant. And there is no shifting occurs, so planets do not seem to be twinkle.
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
Table 10.3 Absolute refractive index of some material media
NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:
Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 2 , Question 11: Explain why the planets do not twinkle.....
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