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Question A1
A HeNe laser emits a light beam of wavelength 633 nm in air, with a beam diameter of 3 mm and
emitted power of 25 mW. Evaluate:
i) the wavenumber ko,
ii) the angular frequency w, and
iii) the peak amplitude of the electric field E in the laser spot (you may assume beam divergence
due to diffraction is negligible).
Give the appropriate SI units in each case.

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