As salma views a famous impressionist painting that is hung on a wall, her receive visual information about the art and carry this information to her brain.

As salma views a famous impressionist painting that is hung on a wall, her RETINAS receive visual information about the art and carry this information to her brain. At the back of each eye, the retina is a thin sheet of tissue containing several types of cells. The photoreceptor cells in the retina first transform light energy into electrical current. The last processing step in the retina is the activity of neurons calls retinal ganglion cells. The ganglion cells send electrical impulses along their axons, which form the optic nerve that travels into the brain.

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light