A Monochromatic Source Produces Light at a Wavelength of 510 $386$

Multiple Choice

A monochromatic source produces light at a wavelength of 510 nm in air. The wave then passes through water that has an index of refraction of 1.32. The wavelength of the wave in the water is

A) 673 nm.
B) $386$ nm.
C) 510 nm.
D) 623 nm.