Polarizer examples

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The effect of dispersion on the focal length of a lens can be examined by calculating the change in the focal length with wavelength. The table below starts with a biconvex lens designed to have a focal length of 10.0 cm for violet light (400 nm) in crown glass. The focal lengths shown are calculated from the lensmakers equation with radii of curvature 10.62 cm for both surfaces.

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Chromatic dispersion is the change of index of refraction with wavelength. Generally the index decreases as wavelength increases, blue light traveling more slowly in the material than red light. Dispersion is the phenomenon which gives you the separation of colors in a prism. It also gives the generally undesirable chromatic aberration in lenses. Usually the dispersion of a material is characterized by measuring the index at the blue F line of hydrogen (486.1 nm), the yellow sodium D lines (589.3 nm), and the red hydrogen C line (656.3 nm). The dispersion is measured by a standard parameter known as Abbe's number, or the v value or V number, all of which refer to the same parameter:

Oct 3, 2024 — In a polarized light microscope, a polarizer intervenes between the light source and the sample. Thus, the polarized light source is converted ...

PolarizersPhysics

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This optical lens cleaner works for all lenses of microscopes including objectives, eyepieces and Barlow lenses.

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The Ultrafast Spectroscopy Group in the Department of Nuclear Engineering investigates several topics in plasma science and nuclear engineering. Dr.