Question: A sodium lamp emits two very closely spaced wavelengths of A - 589.592 nm and ) = 588.995 nm. The light from this lamp is

A sodium lamp emits two very closely spaced wavelengths of A - 589.592 nm and ) = 588.995 nm. The light from this lamp
is incident on a diffraction grating, which has 4000 groves per cm, Calculate the angular separation of the two wavelengths in the
first-order diffraction spectrum.

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