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A step-down transformer is used to:
A. increase the power
B. decrease the power
C. increase the voltage
D. decrease the voltage
E. change ac to dc
A laser in a compact disc player generates light that has a wavelength of 780 nm in air. The light then enters into the plastic of a CD. If the index of refraction of plastic is 1.55, the speed of this light once enter the plastic is
1.94 x 10^8 m/s (Correct)