There is nothing like only a set or questions or question bank from which the question paper needs to be set. Hence, we can never say these are the questions which will come for the exam.

However, knowing the concept is very important to answer any kind of question like MCQ, short and long answer. You can go through previous exam questions also to get an idea.

The basic concept of refractive index is when there are different mediums, light travels differently in different medium.

• You may be given figures and asked to choose the correct path of light when it travels through a glass slab
• Write the laws of refraction. Explain with the help of diagram, when ray of light passes through a rectangular slab.
• How is refractive index related to speed of light?

So, any of these questions can be answered if you know the concept well.