A beam of red light of wavelength $720 nm$ is incident normally on a diffraction grating and produces a diffraction pattern on a screen placed parallel to the grating.
The beam of red light is replaced with a beam of electromagnetic radiation of wavelength $X$, which is incident normally on the same diffraction grating.
The third-order maximum for the electromagnetic radiation of wavelength $X$ is at the same position on the screen as the second-order maximum for the red light.
What is wavelength $X$?
$480 nm$
2 )
$540 nm$
3 )
$960 nm$
4 )
$1100 nm$
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