What causes the different colors of visible light in the electromagnetic spectrum? A. Different wavelengths
B. Different amplitudes
C. Different frequencies
D. Different speeds

A) Different wavelengths

As the full spectrum of visible light travels through a prism, the wavelengths separate into the colors of the rainbow because each color is a different wavelength. Violet has the shortest wavelength, at around 380 nanometers, and red has the longest wavelength, at around 700 nanometers.

(Science.NASA.org)

A different wavelenghts

They are both used to view parts of the cell

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.