Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine
COVERSLIP
Thin glass, plastic, sapphire, SiO, NaCl, etc. Shaped into circles, squares, or rectangles for covering the specimen. Glass coverslips, grade no. 1 1/2, contain a tall proportion of covers from 0.17 to 0.18 mm in thickness, close to the lens designer's specifications for employment of achromatic and apochromatic objectives of tallnumerical aperture. The thickness and refractiveindex of the glasscoverslip are significant because determined of their values have been assumed by the designer and manufacturer. These values have been specified by ASTM: thickness, commercial number 1 1/2: 0.16 to 0.19 mm, refractiveindex measured at the sodium D lines (589.3 nm), 1.523(0.005).