Question

Why is the objective lens the most important optical component?

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Answer 1

An objective lens is an essential optical unit, which verifies the basic performance and function of an optical microscope. Wide variety of objective lenses are available according to their purpose to provide the performance and function for various requires and their applications. Microscope has three or four objective lenses with different magnifications, attached into a circular "nosepiece'' which may rotate to select the required lens. These lenses are color coded for easier use. The objective lens of a microscope is the one at the bottom near the sample. It is a very high-powered magnifying glass with very short focal length. This is brought very close to the specimen being examined, therefore the light from the specimen comes to a focus inside the microscope tube. The objective itself is usually a cylinder which contains one or more lenses that are typically made of glass. It has function to collect light from the sample. This lens in which such correction is made characteristics in powerful concave optical components in the front-end lens group and powerful concave ones in the back-end group.