M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

A beam of light traveling through air is first refracted by a lens and then reflected by an imperfect mirror (i.e., some of the energy from the photons are absorbed by the mirror). Which of the following remains constant at the start and end of the experiment?

I. wavelength
II. frequency
III. speed

A

I and II only

B

III only

C

I, II, and III

D

II and III only