Assertion (A): The refractive index of diamond is √6 and refractive index of a liquid is √3. If the light travels from diamond to the liquid, it will be internally reflected when the angle of incidence is 30°.
Reason (R): μ = 1 / sinC, where μ is the refractive index of diamond with respect to liquid.
Explanation: when light travels from denser medium to lesser denser medium then total internal reflection occurs.
sin C = 1 / n
- C is the critical angle
- n is the refractive index of denser medium (here, diamond).
Therefore, the Refractive index of diamond w.r.t. liquid
Thus, the critical angle is 45 degrees. Therefore, TIR will not take place at 30 °.
- Assertion is false
- Reason is true
So, the correct answer is (d)
Correct option: (d)