Optics Question 21
Question: Assertion : Critical angle of light passing from glass to air is minimum for violet colour. Reason : The wavelength of blue light is greater than the light of other colours.
Options:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Show Answer
Answer:
Correct Answer: C
Solution:
$ \mu \propto \frac{1}{\lambda }\propto \frac{1}{C} $ .
$ {\lambda _{V}} $ is least so CV is also least.
Also the greatest wavelength is for red colour.
