1. A light ray incident on a block of glass makes an incident angle of 50.0° with the normal to the surface. The refracted ray in the block makes an 36.1° with the normal. What is the index of refraction of the glass?
2. A light ray traveling from a higher index-of-refraction medium to the lower (for example, from water into air) would bend away from the normal. When the refracted ray is parallel to the boundary of the medium, θ2 = 90°. What is called the incident angle, θ1 that becomes θc.