Question

Assertion: The twinkling of stars is due to reflection of light.
Reason: The velocity of light changes while going from one medium to the other.

A. Both Assertion and reason are correct and reason is the correct explanation for Assertion
B. Both Assertion and reason are correct but reason is not the correct explanation for Assertion
C. Assertion is correct but reason is incorrect
D. Assertion is incorrect but reason is correct

Answer 1

Before attempting this question, one must have prior knowledge about the reflection of light and also remember that due to the atmosphere of earth light gets refracted, using this information will help you to approach the solution of the question.

Complete answer:
To identify the correct option let’s discuss about the given statements
Assertion: The twinkling of stars is due to reflection of light.
In the given statement it is mentioned that reflection of light is the reason behind the twinkling of the stars
We know that when light travels from star to earth it travels through the atmosphere of the earth but due to different temperature and densities compare to space when light comes in the atmosphere of earth it gets refracted since it came from rare medium to denser medium this is the reason which is responsible for the decrease in speed and bending of light which is the reason behind the twinkling of star.
Since, the Assertion is not correct where s reason is correct

So, the correct answer is “Option D”.

Note:
In the above solution we came across the term “reflection” and “refraction” where reflection can be defined as the property of light in which when light is projected on the surface it gets bounced back in different direction, whereas in refraction when light travels through one medium to another medium the direction of light changes.