A material has an index of refraction of 1.92 for light from a 560 nm source. What is the speed of light for this wavelength within the material? (c = 3.00 × 10^8 m/s)
a. 2.19 × 10^8 m/s
c. 1.56 × 10^8 m/s
b. 4.68 × 10^8 m/s
d. 1.92 × 10^8 m/s
C
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