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If a red-green flag is seen in green light it appears to be of which of the following colour?

  • A.Black
  • B.Green
  • C.Red - black
  • D.Black - green

Answer: D

It appears black and green.

A coloured surface shows the colour it reflects. In green light the green portion of the flag reflects green and looks green; the red portion has no red light to reflect and absorbs the green, so it looks black.

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