Final answer:
Changing the wavelength of light shifts its color within the visible spectrum but does not affect its brightness; red has the longest wavelength and violet has the shortest in the visible spectrum.
Step-by-step explanation:
When discussing how changing the wavelength affects the light you see, the correct answer is: C. Changing the wavelength shifts the color of the light.
The wavelength of light determines its color when within the visible spectrum. For example, light at the red end of the spectrum has longer wavelengths, while light at the blue or violet end has shorter wavelengths. This corresponds to a shift in color perception rather than a change in brightness or dimness. Changes in wavelength related to motion, like Doppler shifts, also cause perceived colors to change, known as blueshift and redshift. It is important to note that the wavelength of light informs its hue, not its intensity. Hence, the brightness (intensity) of the light is not directly affected by changes in wavelength.