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UPSC Prelims 1990Question 9Science & Technology

Given below are colours of the visible spectrum. Identify the correct sequence in order of Increasing wavelengths.

Options

  1. (a)Red, Yellow, Blue, Violet
  2. (b)Violet, Yellow, Blue, Red
  3. (c)Blue, Yellow, Red, Violet
  4. (d)Violet, Blue, Yellow, Red

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