A light microscope uses focused light and lenses to magnify an object. Light microscopes come in several forms. (1) Simple light microscopes use a single lens to magnify an object and cannot reach high magnification just like a handheld lens whose highest clear magnification in the best conditions is 25x. (2) Compound light microscopes use two sets of lenses - an objective lens and an eye piece. This is the type of light microscope whose magnification power reaches between 1000x and 2000x.
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The reason why research and development is an integral part of the designing and producing process of an aerospace product is that the aerospace industry is constantly pushing the limits of technology. Hope this answers your question.
All the answers are written on the same page just in a different way look for them!