... points, rather than a single fused image. For the light microscope this distance is approximately 0.2µm. So in theory it might seem possible to magnify an object indefinitely by means of glass lenses in series. This has been put into practice and has only produced a larger and fuzzier picture; so the resolution is not improved and no more detail is visible. The resolution of the light microscope is imposed by the wavelength of visible light, and means that little is gained by magnifying an object more than 1500 times. This limits the amount of structural detail that can be seen within a cell. Higher magnification with good resolution can be obtained by using a special objective lens. This lens is called an Oil Immersion lens; this is a lens with fluid (oil) between the lens and the objective, but even with this lens it not possible to achieve effective ...

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