Optics and Optical Instruments by B.K. Johnson
A wonderful classic optical book.
Explains optical principles of Elementry Lenses and Experiments, Telescopes, Telescope Testing, Microscopes, Photographic Lenses, Optical Projection Systems, Prisms, plus much more.
Loaded with illustrations and photographs.
Only simple math is used throughout the book, making it a fun reading book.
I have two, I am keeping one,(it is a must have).