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Q: Why does a piece of cloth, which appears green in sunlight, appear black when it is viewed under red light?
  • A. The cloth completely absorbs red colour wavelength
  • B. It is due to refraction
  • C. It is the effect of scattering of light (
  • D. It is due to parallax error
Correct Answer: Option A - A cloth that appears green in sunlight, appears black when seen in red light because the cloth absorbs the wavelength of red colour completely. The object absorbs all colours, and does not reflect any colour, making the object appear black.
A. A cloth that appears green in sunlight, appears black when seen in red light because the cloth absorbs the wavelength of red colour completely. The object absorbs all colours, and does not reflect any colour, making the object appear black.

Explanations:

A cloth that appears green in sunlight, appears black when seen in red light because the cloth absorbs the wavelength of red colour completely. The object absorbs all colours, and does not reflect any colour, making the object appear black.