The Wonders of Optics

amongst angle apparatus appear astronomer beautiful blue body brilliant burning called camera lucida camera obscura cause centre CHAPTER colour colour-blindness concave mirror consequently convex lens crystalline lens dark diameter disappear disc distance easily effect examined experiments eye-piece fact feet figure flame focus give glass green Gregorian Telescope image formed imagination impression inches infinite number instance instrument John Herschel lamp lenses lines Lippershey looking luminous magic lantern magnifying manner means mentioned metal microscope mind natural nebulæ Newtonian telescope object object-glass observer optical illusion opticians orange ordinary painted pass perceived phantasmagoria Phenakistiscope philosopher picture piece placed portion position possessed prism produced properties rays of light reflected refracted retina Robertson screen seen shadows shown side sight simple solar spectrum spectators spectres star stereoscope suddenly surface telescope tint tion tube vibrations violet vision waves wonderful yellow