Terms and also Definitions

Microscope: a device for magnifying objects that room too tiny to be seen with the naked eye.

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an easy microscope: single lens magnifier link microscope: employs 2 or an ext lenses

Parfocal: the objective lenses are an installed on the microscope so the they can be interchanged without having to appreciably differ the focus.

Resolving strength or resolution: the ability to differentiate objects that space close together. The better the fixing power of the microscope, the closer with each other two objects can be and still be seen as separate.

Magnification: the procedure of enlarging the size of one object, as an optical image.

Total magnification: In a compound microscopic lense the complete magnification is the product of the objective and ocular lenses (see number below). The magnification of the ocular lenses on her scope is 10X.

objective lens X Ocular lens = Total magnification For example: low power: (10X)(10X) = 100X high dry: (40X)(10X) = 400X oil immersion: (100X)(10X) = 1000X

Immersion Oil: Clear, carefully detailed images are achieved by difference the specimen with their medium. Transforming the refractive table of contents of the specimens native their medium attains this contrast. The refractive index is a measure of the relative velocity at which light passes v a material. As soon as light light ray pass v the two materials (specimen and also medium) the have different refractive indices, the rays change direction native a straight course by bending (refracting) in ~ the boundary in between the specimen and also the medium. Thus, this boosts the image’s contrast between the specimen and the medium.

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One means to adjust the refractive index is by staining the specimen. Another is to usage immersion oil. While we desire light to refract differently between the specimen and also the medium, we perform not desire to lose any type of light rays, as this would certainly decrease the resolution the the image. By placing immersion oil between the glass slide and the oil immersion lens (100X), the light rays at the highest magnification deserve to be retained. Immersion oil has the same refractive index as glass therefore the oil becomes component of the optics that the microscope. Without the oil the irradiate rays room refracted together they get in the air between the slide and also the lens and the target lens would need to be increased in diameter in order to record them. Utilizing oil has actually the same result as boosting the objective diameter because of this improving the resolving power of the lens.


Lab 1 / Ubiquity of microbe / Microscopy

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