CX41 Parts and functions

Objectives – E

The objectives and eyepiece lenses determine the visual magnification of the specimen. There is a series of numbers on the objective. The magnification is shown as 4X, 10X, 40X and 100X. The 100X objective a special objective used with oil immersion. Another important number on the objective is the numerical aperture and follows the magnification. 40X/0.65 is a forty power objective with a numeric aperture value of 0.65 which is used to set the aperture iris diaphragm (G).