Match the lens (condenser, high-dry, low-power, ocular, or oil immersion) to its description.A diaphragm is used to regulate light passing through this lens.
Match the lens (condenser, high-dry, low-power, ocular, or oil immersion) to its description.A diaphragm is used to regulate light passing through this lens.
The lens is a part of eye which plays an important role in the vision. If its shape is changed, it changes the focal length of the eye. It works with retina to refract or bend the light rays falling on the retina of eye. The shape of lens is curved or rounded outwards on both the sides (biconvex) and ellipsoid ( a sphere that is stretched out).
Condenser: A condenser is a device ( optical) which is used for the conditioning illumination of light e.g; in a microscope. It consists of one or more lenses and a diaphragm. Also multiple condensers are often called condenser lenses. It has an influence on the imaging performance of the instrument. The different aspects that condenser includes are
- Image brightness and numerical aperture : For the high brightness of image, a condenser has to send as much as the available light that is illuminating to the specimen. The maximum numerical aperture can be read fro m the condenser housing onto which it is engraved.
- Uniform illumination
- Aberrations
High-dry: When the specimen is in focus under the low power and the microscope is properly kohlered, it can be moved now to the high-dry i.e ;40x objective. Now the microscope is parfocal that means once the specimen is focus under one objective lens, it will be in the focus under other objective lens.
Oil immersion: The immersion objective lenses have a greater resolution as compared to the dry objective lenses as they gather light more efficiently. TO meet this property, they have to be optically coupled to the cover slip. Commonly this is done with the usage of oil, but some immersion lenses are made with the use of glycerol or water.
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