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Optics and Waves CSET
CSET Science I
8
Science
Professional
02/10/2013

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Term
Diffuse Reflection
Definition
The reflection of light from a rough surface in which the incident light rays are reflected from the surface at many different angles.; In diffuse reflection, light reflects in many directions. In specular reflection, the light mostly emerges in one direction
Term
Retinal Cells / Retinas
Definition
CONES = COLOR Rods are not good for color vision. In a dim room, however, we use mainly our rods, but we are "color blind." The rods are most sensitive to light and dark changes, shape and movement and contain only one type of light-sensitive pigment. The cones are not as sensitive to light as the rods; cones only work in bright light; responsible for color.
Term
Wavelength for vision
Definition
Correct! The eye is sensitive to the range from about 400 nm (400 x 10-9 m, or 4 x 10-7 m) to 700 nm. The only answer that falls in this range is 5 x 10-7
Term
Nanometer
Definition
Most common measurement of distance for the wavelengths of light. A nanometer is equal to one billionth (10 to the ninth) of a meter.
Term
Specular Reflection
Definition
In specular reflection, light hitting the object from one direction is all reflected in another direction. A mirror reflects this way, as does any glossy surface. The still surface of a pond can give a specular reflection. (as opposed to diffuse)
Term
Specular Diffusion
Definition
Reflection off of smooth surfaces such as mirrors or a calm body of water leads to a type of reflection known as specular reflection. Reflection off of rough surfaces such as clothing, paper, and the asphalt roadway leads to a type of reflection known as diffuse reflection.
Term
An object can reflect in both a specular and diffuse way at once.
Definition
Term
Line of Sight
Definition
Our view of an object is along a line of sight. The line of sight is the straight line from our eye (or eyes) to the object. Actually, we don’t see a single ray, but a bundle of rays forming a thin cone. The pupil in the eye can capture a small bundle of light rays emanating from a glowing object in slightly different directions.
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