PSY280H1 Chapter Notes - Chapter 3: Test Light, Isomerization, Opsin
13
PSY280H1 Full Course Notes
Verified Note
13 documents
Document Summary
Light: the stimulus for vision: electromagnetic spectrum continuum of electromagnetic energy, waves, produced by electric charges, Wavelength distance btwn peaks of em wave. Ranges: ex. gamma (10-12m) to radio (10km: visible light energy within em spec human can perceive. Wavelength 400 to 700 nm (1 nm = 10-19m) Different wavelength = different colors: light also has particle like properties. Myopia (nearsightedness) inability to see distant objects clearly: parallel light rays entering eyes focus in front of retina, reasons: Refractive myopia cornea and/or lens bends light too much. Axial myopia eyeball too long: solutions: Bring stimulus closer, push focus point back. Corrective lens, bend incoming light as if were at far point. Hyperopia (farsightedness) inability to see near objects clearly: parallel light rays entering eyes focus behind eyeball, far objects can accommodate. Photons small packets of energy, makes up light. Near objects req. too much accommodations headaches. 1 photon = smallest possible packet of light energy: solution: also corrective lenses.
