Optics Question 7
Question: Assertion : The refractive index of diamond is $ \sqrt{6} $ and that of liquid is $ \sqrt{3} $ . If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30o. Reason : $ \mu =\frac{1}{\sin C}, $ where m is the refractive index of diamond with respect to liquid.
[AIIMS 2000]
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: E
Solution:
For total internal reflection the angle of incidence should be greater than the critical angle. As critical angle is approximately 35°.
Therefore, total internal reflection is not possible. So, assertion is not true but reason is true.
