Academic session 2026-27, Chapter 10 in the current curriculum.
Welcome to the NCERT Solutions for Class 10 Science - Chapter The Human Eye and the Colourful World. This page offers a step-by-step solution to the specific question from Exercise 0, Question 30:
How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?
. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?
When the ray of light enters a glass prism, it bends because of the refraction of light. The light deviates from its original path because of the unique shape of the prism. Every coloured band has different speed and contains different angles of deviation. And then it will lead to the appearance of a band of seven colours which are the components of the white light. The various colours are seen- violet, Indigo, blue, green, yellow, orange and red and the acronym will be VIBGYOR.
Stars twinkling appear due to the atmospheric refraction of the starlight. When the starlight enters on the earth surface, refraction undergoes continuously with gradual changes in refractive index before it reaches the earth surface. The atmospheric physical condition does not remain stationary, the apparent position (when the star is slightly different from its original position) of the stars will also not be stationary. When the refractive index changes continuously due to which path of the light rays from the stars keeps on changing the path continuously. As the path of rays of light that comes from the stars, goes on varying slightly. The apparent position of the stars fluctuates and the starlight enters the eye- sometimes the star may appear brighter, and sometimes this effect is known as the twinkling effect.
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 comes to our eyes from all the individual extended sources are constant. And there is no shifting occurs, so planets do not seem to twinkle.
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:
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 30: How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?....
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