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Fill in the blank. In a Ruby laser, the colour of laser light is due to

1. Oxygen
2. Aluminium
3. xenon
4. Chromium

Correct answer: Chromium

Solution

A ruby laser uses a crystal of aluminum oxide (Al2O3) doped with chromium ions. The chromium ions are the active centers that produce the red laser light, so the color is due to chromium.

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