1. The problem statement, all variables and given/known data I have a final tomorrow, and I there are a couple questions that I don't know. When the angle of incidence is the critical angle, the angle of refraction will be? If a screen is moved 3 times the distance from a light source, what will the intensity on the screen be reduced to? A ray of light is incident at 38º on a curved mirror. At what angle will the reflected ray leave the mirror? 2. Relevant equations n1sin90º=n2sin(critical angle) I'm not sure which formula to use for the one regarding light intensity, and for the last, I drew it out.