In Figure a, a light ray in an underlying material is incident at angle 1 on a boundary with water, and some of the light

In Figure a, a light ray in an underlying material is incident at angle θ1 on a boundary with water, and some of the light refracts into the water. There are two choices of underlying material. For each, the angle of refraction θ2 versus the incident angle θ1 is given in Figure b. The horizontal axis scale is set by θ1s = 90?. Without calculation, determine whether the index of refraction of

(a) Material 1 and

(b) Material 2 is greater or less than the index of water (n = 1.33). What is the index of refraction of?

(c) Material 1 and

(d) Material 2? When the top with an with the top of refracts toward

90 Water 45 0 (a) (b)