Silicon carbide (SiC) is often the material of choice for numerous applications at high temperatures because of its unique combination of physical, thermal, and mechanical properties. 1 For example, SiC retains mechanical strength up to 1500°C 2 and has low density compared to most structural metals, high elastic modulus, high thermal conductivity, 3 low
In optics, as it is treated at the advanced level or thereabouts (Nelkon and Parker 1966), an expression for the angular magnification, or magnifying power, of a compound microscope, is often given in the form Here M is the angular magnification, f, andf, the focal lengths of the objective and eyepiece respectively, u1 the image distance of the objective, and D is the image distance of the eyepiece (for a virtual image). Then it is taken that the virtual image will be at the near point, so that D will be -25 cm.
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