Optical system for microscopes

摘要

An optical system for microscopes includes an objective lens for collimating beams of light emanating from an object and an imaging lens for forming parallel beams emerging from the objective lens into an image of the object at a predetermined position, and satisfies the equation: 0.5 f<W<1.1 f where W is the variable amount of spacing from the contact surface of the objective lens to the surface of incidence of the imaging lens and f is the focal length of the imaging lens. Thus, the optical system for microscopes allows a large variable amount to be secured while holding a good imaging condition and is unsurpassed in extensity of the system to be able to accommodate various modes of observation.