A beam of light in air makes an incident angle with the normal at 53 with an unknown substance. Part of the light is relected and part is refracted into the substance. The reflected ray and the refracted ray make an angle of 90 degrees.
a) What is the refracted angle?
b) what is the index of refraction for the substance?
c) the critical angle if the ray goes from the unknown substance into air?
I think we use , Snells law nsin() = nsing () ; where () = Angle