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MCQ practice · SSC Physics Board questions · Chapter 8: Reflection of Light

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What is the range of the wavelength of visible light?

Think it through first, then pick an option.

  1. a 400 nm − 500 nm
  2. b 500 nm − 700 nm
  3. c 600 nm − 700 nm
  4. d 400 nm − 700 nm
Answer and explanation

Correct answer: d 400 nm − 700 nm

The book says we see light when the wavelength is from 400 nm to 700 nm. 400 to 500, 500 to 700 or 600 to 700 nm are only parts of the range.

Why the other options are wrong

  • a 400 nm − 500 nm: This is not the answer: The book says we see light when the wavelength is from 400 nm to 700 nm. 400 to 500, 500 to 700 or 600 to 700 nm are only parts of the range.
  • b 500 nm − 700 nm: This is not the answer: The book says we see light when the wavelength is from 400 nm to 700 nm. 400 to 500, 500 to 700 or 600 to 700 nm are only parts of the range.
  • c 600 nm − 700 nm: This is not the answer: The book says we see light when the wavelength is from 400 nm to 700 nm. 400 to 500, 500 to 700 or 600 to 700 nm are only parts of the range.