Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children. Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children.
Contrast sensitivity is the ability of an imaging process to produce an image of objects or tissues in the body that have relatively small physical differences or inherent contrast. The contrast that is to be imaged is in the form of some specific physical characteristic.
Specular, or mirrorlike, reflection is the kind that produces visible images. Diffuse reflection is the kind that does not produce visible images. Tell the difference between specular and diffuse reflection. Relative to the wavelength of visible light, the surface of paper is like a terrain of hills and valleys. Because light is reflected from these hills and valleys in many different directions, the reflected is diffuse, or scattered.