Question

A ray coming in the normal direction to one side of the equilateral triangular prism having a total reflection at the prism. minimum value of the refractive index of the prism is ...

Answer 1

This sounds like a physics problem. I would suggest asking the physics section they will definetly have a better answer to your question.

Answer 2

where is it??

Answer 3

Just click on the drop down list that gives you the list of all subjects. Then click on "FIND MORE SUBJECTS". A window will appear then type physics and you should see it.