is quick and effective at removing various contaminating particles from floors, ceilings, walls, table tops and other surfaces. the concept is similar to the common paint roller; a roller handle with cover. the cover in this case is a roll of adhesive coated substrate that has removable sheetssimilar...
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spectrometer splits light into the wavelengths that make it up. early spectroscopes used prism that split the light by refraction — bending the light waves as they ... continue reading "direct vision spectroscope(hand spectroscope)" double concave lens double concave lens – physics optical equipment spherical...