Light of frequency $6.7{\text{ }} \times {\text{ }}{10^{14}}$ Hz in a vacuum is incident normally on a diffraction grating that contains $4.0{\text{ }} \times {\text{ }}{10^5}$ lines ${m^{ - 1}}$ .
What is the angle between the adjacent second and third order intensity maxima?
$12^\circ $
2 )
$21^\circ $
3 )
$33^\circ $
4 )
$54^\circ $
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