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Glossary terms about Coverslip

A rectangular or circular piece of thin glass used to cover a microscopical preparation. It is regarded as part of the objective and thus its thickness, refractive index and dispersion must be adapted to the demands of the objective.

2 pages mention Coverslip

Components of the confocal microscope
So if our specimen is in a permanent mounting medium of refractive index (n) ~ 1.5, we put immersion oil of the same index between the coverslip and the lens.