What group of organisms require oil immersion magnification to observe them?

Answer 1

germ's

Answer 2

Oil immersion is required for most organisms that are smaller than protozoa--ricketsia, smaller bacteria, and the like. There is a specific size of organism in microns, but I can't quite remember as it's been a decade or so since I've done any microbiology.

Oil immersion makes smaller resolution visible by reducing the refractive difference between media. You know how you look down at your feet in the swimming pool and their actual location is slightly off from where they appear to be--that's a refractive difference resulting from light moving different speeds in water as opposed to air. With a standard wet-mount, you must go from water to air to glass, each with a refractive difference between them as you change media. With oil immersion, you only have to go from oil to glass because you immerse the microscope lense in the oil.

Answer 3

Bacteria and some smaller organisms are observed under oil immersion.

Answer 4

Viruses. We use oil immersion and staining to view them under the microscope. Never used oil immersion for bacteria, since you can usually tell them apart using other tests. Fungi can be seen using a regular old light microscope or stereoscope.

Answer 5

OIl immersed lenses are used to reduce the amount of refraction due to light passing through various media (ie, air to glass, back to air).
So oil immersed lenses would be used to view very small organisms such as small bateria or fungi

Answer 6

science teacher is right. bacteria, which are about 5micrometers or smaller, would require oil immersion.