What is COMBINATION?

The act of grouping or uniting; chemic union. C.-back, in the microscope, the lens-system of an objective farthest from the object, composed of a plano-concave of flint glass and a bi-concave of crown glass, or a bi-concave and two bi-convex glasses. C.-front, in the microscope, the lens-system nearest the objective.

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Definition of  COMBINATION