A) Blue
B) Red
C) Black
D) White
Correct Answer: C
Solution :
When red coloured marbles are put inside the blue coloured vase, it will appear black because when light is incident on blue coloured vase which is transparent (Glass), it absorbs all the colours of white light except blue, and when blue colour light incident on red marbles it will absorb blue colour and no light will be emitted by it. So it will appear black.
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