A ruby crystal doped with chromium ions

Absorbs red light

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Absorbs green light

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Absorbs blue light

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Emits green light

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Solution

The correct option is B Absorbs green light
When a ruby crystal is doped with chromium ions then it absorbs the green light. This is because of energy levels of $C r^{3 +}$ ions are such that it absorbs first green light and then blue light from the white light which falls on it.

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