TEST BANK CHAPTER 21. Our perception of the environment depends ona. the properties of the objects in the environment.b. the properties of the electrical signals in the nervous system.c. both the properties of the environmental objects and properties of the electrical signals in the nervous system.d. none of these are true. ANS: C REF: Starting at the Beginning MSC: Conceptual 2.Visible light is between _____ and ____ nm within the electromagnetic spectrum.a. 100; 400 c. 500; 1000b. 400; 700 d. 900; 1500 ANS: B REF: Light: Stimulus for Vision MSC: Factual3. A wavelength of 100 nm would fall in the ______ range of the electromagnetic spectrum.a. X-rays c.infrared raysb. ultraviolet rays d. gamma raysANS: B REF: Figure: Electromagnetic Spectrum MSC: Factual4. Light can be described in terms of wavelength, or as consisting of small packets of energy calleda. photons. c. ions.b. electrons. d. pulsarsANS: A REF: Light: Stimulus for Vision MSC: Factual5. The structure of the eye that provides about 80% of the eyes focusing power is thea. iris. c. cornea.b. pupil. d. lens.ANS: C REF: Light Focused by the Eye MSC: Factual6. Jan tries to focus on the tip of her pencil as she brings it closer to her.