37. The wave length of yellow sodium light in air is 589 nm. What is its wave length in glass in which the velocity of light is 1.97 × 108 meters per second? Answer in nm.
(A) 256
(B)387
(C) 895
(D) 589

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統計: A(0), B(4), C(0), D(2), E(0) #874940