Michelson measured the length of a standard meter in terms of the wavelength of:
Correct answer: C. Red cadmium light
- A. Green cadmium light
- B. Violet cadmium light
- C. Red cadmium light
- D. Blue cadmium light
Explanation
It is a fact.Albert A. Michelson, in 1893, measured the length of a standard meter in terms of the wavelength of red cadmium light. He used interferometry to determine the wavelength of light emitted by heated cadmium and defined the meter based on a specific multiple of this wavelength. This method provided a more precise and reproducible measurement compared to the physical platinum-iridium meter bar used previously
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About Optics
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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