The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high - powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes to a focus inside the microscope tube. The objective itself is usually a cylinder containing one or more lenses that are typically made of glass; its function is to collect light from the sample.
what is the function of objective lens in microscope
to collect light from the sample