The drawing shows a crystalline quartz slab with a rectangular cross section. A ray of light strikes the slab at an incident angle ofθ1= 38°, enters the quartz, and travels to point P. This slab is surrounded by a fluid with a refractive indexn. What is the maximum value of n such that total internal reflection occurs at point P? (nquartz= 1.544)
https://www.webassign.net/CJ/26-p-030.gif