During a vision test, Michael is asked to identify when he first notices a light being turned on in a dark room. The intensity of the light is gradually increased from complete darkness. What is this test measuring?

Which of the following best demonstrates the sensitivity of human vision under optimal conditions?

The characteristic of light that influences whether a color looks highly saturated or more grayish is the __________.

What aspect of light's physical properties influences the perception of color purity or saturation?

Which of the following statements best defines white light?

In an experiment to determine the minimum level of light intensity that a person can perceive, the researcher is concerned about the participants' tendency to report seeing the light even when it is not present. Which method could best address this issue?

In the context of color perception, how does the concept of saturation relate to the appearance of colors in a rainbow observed after a rain shower?