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Chapter 18 Vocabulary – Optics and Light 1. optics – the study of visible light and the ways in which visible light interacts with the eye to produce vision. 2. law of reflection – states that the angle of reflection equals the angle of incidence. 3. regular reflection – the reflection of parallel light rays all in the same direction. 4. diffuse reflection – the reflection of parallel light rays in many different directions. 5. image – a picture of an object formed by waves of light. 6. convex – curved outward. 7. concave – curved inward. 8. focal point – the point at which the rays meet after reflecting from a concave mirror or being refracted by a convex lens. 9. lens – a clear optical tool that refracts light. 10.focal length – the distance from the center of the lens to the lens’s focal point. 11.cornea – a transparent membrane that covers the eye. 12.pupil – a circular opening that controls how much light enters the eye. 13.retina – structure of the eye that contains specialized cells that respond to light and where the image of an object is projected. 14.laser – a device that produces an intense, concentrated beam of light that is brighter than sunlight. 15.fiber optics – technology based on the use of laser light to send signals through transparent wires called optical fibers.