What is the principle of the objective and eyepiece in a compound microscope?

The objective lens collects and magnifies the image, while the eyepiece further magnifies and focuses it.

In a compound microscope, the objective lens is responsible for collecting and magnifying the image of the specimen. It is located near the specimen and has a short focal length, which allows it to produce a highly magnified image. The objective lens is made up of several lenses that work together to produce a clear and sharp image.

The eyepiece, on the other hand, is located near the observer's eye and further magnifies and focuses the image produced by the objective lens. It is also made up of several lenses that work together to produce a clear and sharp image. The eyepiece has a longer focal length than the objective lens, which allows it to magnify the image even further.

The combination of the objective lens and the eyepiece produces a highly magnified image of the specimen, which can be observed by the observer. The magnification of the image is determined by the ratio of the focal lengths of the objective lens and the eyepiece. The higher the magnification, the greater the resolution and the ability to see fine details of the specimen.

Overall, the principle of the objective and eyepiece in a compound microscope is to collect, magnify, and focus the image of the specimen, producing a highly magnified image that can be observed by the observer.