Which of the following are true? A. Speed of light in vacuum is dependent on the direction of propagation. B. Speed of light in a medium is independent of the wavelength of light. C. The speed of light is independent of the motion of the source. D. The speed of light in a medium is independent of intensity. Choose the correct answer from the options given below:
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For questions on the speed of light: • In vacuum, light speed is constant and independent of source motion. • In a medium, dispersion occurs, making speed wavelength-dependent.