A ray of light is incident on a glass/air interface from the glass side. The ray is incident at a 30- degree angle. C11] If this is the minimum angle for which we observe Total Internal Reflection, find the index of refraction 'n' of the glass AND the speed of light in the medium {you may give the speed as a multiple of 'c'.) C12] Assume now the ray is instead incident on the glass/air interface from the AIR side. The ray is again incident at a 30-degree angle. Find the angle of refraction. If the ray has a frequency of 640 Hz, what is the wavelength in the air? In the glass? C13] Draw a diagram showing the following for question 2 The interface and normal planes The incident ray, reflected and refracted ravs (It is helpful to also draw a ray within the glass as a dotted line, parallel to the incident rav. This shows the 'refracted' rav if n1=n2.] The incident, reflected, and refracted angles