MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : The twinkling of stars is due to the fact that refractive index of the earth's atmosphere fluctuates.
Reason : When light propagates from one medium to another its direction of propagation changes.
Assertion : The twinkling of stars is due to the fact that refractive index of the earth's atmosphere fluctuates.
Reason : When light propagates from one medium to another its direction of propagation changes.
- ✓Both $A$ and $R$ are true and $R$ is correct explanation of the assertion.
- BBoth $A$ and $R$ are true but $R$ is not the correct explanation of the assertion.
- C$A$ is true but $R$ is false.
- D$A$ is false but $R$ is true.