Single Focal Length Lenses

The  functions of Single Focal Length Lenses are similar to that of Zoom Lenses, the difference is that the focal length are non-variable. Which means user will have to move its position in order to frame the subject accordingly.  It is also further broken down into 3 sub-categories, just like the Zoom Lenses, namely, Wide-Angle, Normal and Telephoto.
Below are some of the examples of the range of focal length in each type.