# Reflection and refraction are examined.

Please help with the following problem.

A multiple ray projector, with the rays parallel, strikes the prism from various angles and sides. How would you obtain total internal reflection?

If you set it up so the incoming rays are turned through an 180 degree angle, what would the ray diagram look like (draw diagram)?

Is it possible to calculate the index of refraction of plastic from the critical angle?

https://brainmass.com/physics/light-refraction/reflection-refraction-examined-234309

#### Solution Preview

Dear student...

It is a very good question about the prisms. Let us start our discussion regarding the situation from the level that you have a minimal idea about the refraction in prisms.

I think you have an idea about the expression for the refractive index of a prism given by:

u = (sin((A+D)/2)/(sin(A/2)), where A represents the angle of the prism and D stands for the angle of minimum deviation. For any incident ray the refraction in a prism will be as given in the following figure.

(See the attached ...

#### Solution Summary

Reflection and refraction is examined for a multiple ray projector. The expert determines if it is possible to calculate the index of refraction of plastic from the critical angle.