What is the difference between a normal perspective lens a wide angle lens and a telephoto lens?

Briefly and without going into technical detail, a normal perspective lens produced what is seen in the viewfinder, and is normally 50MMM focal length, the wide - angle lens stretches the photograph and shows wider details in the viewfinder. These lenses are norally about 28MM, but variations can go down to 18MM The so called fish-eye lens) which produces distortion in tne photo. Finally, Telephoto lens bring objects closer and enlarge them. These lenses are produced in many focal lengths from 75 to 500MM and above, and are also avalaible in combinations such as 70to210MM and many more lengths. All these lenses have their usages but the selection is complicated by the lens aperture (f number) selected. Would suggest you go and obtain a copy od The Kodak Photography Encyclopedia for more detailed info!!......Dave