| 摘要 |
A glass composition that simultaneously has a low temperature coefficient of refractive index and a good light transmittance, being suitable for use in environments of intense temperature change. There is provided an optical glass containing SiO2, B2O3 and La2O3, which has a temperature coefficient (20° to 40° C.) of relative refractive index (546.07 nm) of 10.0x10-6 (° C.-1) or below. Further, there is provided an optical glass mentioned above having a temperature coefficient (20° to 40° C.) of relative refractive index (546.07 nm) of 4.6x10-6 (° C.-1) or below. Still further, there is provided an optical glass mentioned above having an internal transmittance (tau;10 mm) at 400 nm of 80% or higher
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