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Microscope Optical System - Eyepiece
Eyepiece is also called eyepiece because it is close to the observer's eyes
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eyepieceBecause it is close to the observer's eyes, it is also called an eyepiece. Installed at the upper end of the lens barrel.
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1The structure of the eyepiece：Usually, an eyepiece consists of two sets of lenses, the upper lens is calledeye pieceThe lens below is calledConvergent lens or field lensThere is a diaphragm installed between the upper and lower lenses or under the field lens (its size determines the size of the field of view), because the specimen is imaged precisely on the diaphragm surface, a small piece of hair can be stuck on this diaphragm as a pointer to indicate a target with a certain characteristic.
An eyepiece micrometer can also be placed on top to measure the size of the observed specimen.
An eyepiece micrometer can also be placed on top to measure the size of the observed specimen.
The shorter the length of the eyepiece, the greater the magnification（The magnification of the eyepiece is inversely proportional to the focal length of the eyepiece）.
2The function of the eyepiece：It is to further enlarge the real image that has been magnified by the objective lens and has a clear resolution, to the extent that the human eye can easily distinguish it.The magnification of commonly used eyepieces is5—16Twice.
3The relationship between eyepiece and objective lens:The objective lens has already distinguished the subtle structures clearly. If it is not magnified by the eyepiece and cannot reach the size that the human eye can distinguish, then it cannot be seen clearly; The subtle structures that cannot be distinguished by the objective lens, even after being magnified by a high-power eyepiece, are still unclear,So the eyepiece can only magnify and will not improve the resolution of the microscope.
Sometimes, although the objective lens can distinguish two objects that are very close together, the distance between the images of these two objects is smaller than the resolution distance of the eye, so it is still difficult to see clearly. So, the eyepiece and objective lens are both interrelated and mutually restrictive
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Sometimes, although the objective lens can distinguish two objects that are very close together, the distance between the images of these two objects is smaller than the resolution distance of the eye, so it is still difficult to see clearly. So, the eyepiece and objective lens are both interrelated and mutually restrictive
Technical extension, welcome to log in:
&bid=26
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