Respuesta :
n=2 and n=3 are the dimmest order of bands because of diffraction.
What is a band?
A band is a collection of wavelengths.
Diffraction is the phenomena of the deviating the path of waves around obstacles. Diffraction takes place with electromagnetic radiation.
The order bands n=2 and n=3 are dimmest due to diffraction. When light waves pass through an obstacle, they tend to bend and spread out in the form of spectrum of different colors of brightness. because of which the order bands n=2 and n=3 become dim.
Learn more about diffraction.
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