Optical glass and projection exposure apparatus using the same
The present invention relates to an optical glass, composed of a basic composition of B O -RO (where R indicates Mg, Ca, Sr and Ba), having a refractive index (nd) of 1.52 to 1.65, an Abbe number (vd) of 55 to 61, and an 80% transmission wavelength (at a thickness of 10 mm including no reflection lo...
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