MCQ
A transparent cube of $15 \mathrm{~cm}$ edge contains a small air bubble. Its apparent depth when viewed through one face is $6 \mathrm{~cm}$ and when viewed through the opposite face is $4 \mathrm{~cm}$. Then the refractive index of the material of the cube is
- A$2.0$
- B$2.5$
- C$1.6$
- ✓$1.5$