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The red light emitted by a ruby laser is of wavelength ____________.
Question

The red light emitted by a ruby laser is of wavelength ____________.

A.

456.77 nm

B.

694.3 nm

C.

566.93 nm

D.

775.1 nm

Correct option is B


Ruby Laser:
It is a solid-state laser that uses a synthetic ruby crystal as its gain medium.
It has wavelength of 694.3 nm and produces pulses of coherent visible light of deep red color.

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