The principle of adding cedar oil to microscope oil lenses
Cedar oil is a colorless or slightly yellowish slightly viscous liquid. It is an aromatic oil obtained by distilling cedar wood, which contains olein and cedar wood, and can be used as perfume and microscope oil.
Why do microscope oil lenses need cedar oil?
Because the magnification of the oil lens is high and the lens is small, when the light passes through medium objects of different densities (glass → air → lens), part of the light will be refracted and lost, and the light entering the lens barrel is less, and the field of view is dark. Objects cannot be seen clearly.
If cedar oil (n=1.515), which is similar to the refractive index of glass (n=1.52), is added between the lens and the glass slide, the light entering the oil lens will increase, the brightness of the field of view will be enhanced, and the object image will be clear.
