MAHARASHTRA Class 10: Laws of refraction and Refractive index Videos | Refraction of Light

If the refractive indices of three objects O1, O2 and O3 are 1.33, 1.5 and 2, respectively, then light travels slower in O3.

We know that

Thus, light travels with slow speed in the object having a high refractive index.

When light emerges out of the glass slab into the air, it bends away from the normal. 

The angle formed by the emergent ray with the normal is called the angle of emergence.