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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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