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BK7 Double Concave Lens

BK7 Double Concave Lens
Double concave lens is similar with plano concave lens. The focus length is negative. It can make parallel light diverge outside. The two sides have same radius of curvature. Double convex lens ...

Filters

Filters
Band-pass filter is a kind of optic that can allow specific wavelength light pass and others reflect or cut off. It has many kinds of application like clinical medicine, environmental experiment, ...
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