22. IE •• Light passes from material A, which has an index of refraction of 43

, into material B, which has an index of refraction of 54

.

(a) The speed of light in material A is

(1) greater than, (2) the same as, (3) less than the speed of light in material B. Explain.

(b) Find the ratio of the speed of light in material A to the speed of light in material B.