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 main difference between Rods and Cones is in the outer segment, where the visual pigment is located: 1  Pigment in Rods: On flattened, internalised discs. 2  Pigment in Cones: On a region of infoldings of the membrane.pecial cells called Rods and Cones are used to process light, in a human eye, their number is estimated to be 5-7 million Cones and 110-130 million Rods. Cones are found mainly in the central area of the Retina (Fovea), while Rods are found in the Peripheral Retina.