Michelson devised the formula to calculate the speed of light_______________?
Correct answer: C. C = 16fd
- A. C = 4fd
- B. C = 8fd
- C. C = 16fd
- D. C = 5/2fd
Explanation
In Michelson's rotating-mirror method, light travels a total distance of 2d, and the mirror turns through one-eighth of a revolution during the light's journey, so the time is 1/(8f) seconds. Therefore c = distance/time = 2d x 8f = 16fd, where c is in m/s, d is in m, and f is in Hz. Students may choose b, 8fd, by using only the one-way distance d instead of the round-trip distance 2d.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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