Question: Light passes from material A, which has an index of refraction of 4/3, into material B, which has an index of refraction of 5/4. (a)

Light passes from material A, which has an index of refraction of 4/3, into material B, which has an index of refraction of 5/4.
(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.

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