Author: Joseph Baxter. Linear, quadratic and exponential functions have different graphs, equations, and characteristics. In this tutorial, compare the shape of linear, quadratic, and exponential curves on a graph, and explore how to identify a function as linear, quadratic, or exponential by examining x- and y-coordinates. (more)
The tier of cells at the back of the retina contains the light receptors, the rods and cones. Rods, which are far more numerous than cones, are responsible for our vision in dim light and are out of commission in bright light.
The eye's inner layer is composed of the retina: thin tissue that contains blood vessels and light-sensitive photoreceptor cells called rods and cones. Every human eye contains about 120 million rods and 7 million cones. The rods are very sensitive to low-level light, but they cannot distinguish color.he eye's inner layer is composed of the retina: thin tissue that contains blood vessels and light-sensitive photoreceptor cells called rods and cones. Every human eye contains about 120 million rods and 7 million cones. The rods are very sensitive to low-level light, but they cannot distinguish color.