| 摘要 |
In an optical lens used for a passing light having the maximum intensity on a wavelength (lambdaT) of 780±10 nm, an optical is made such that a reflection preventing coating is provided on both or at least one of a light-incident surface (S1) and a light-outgoing surface (S2) and the following conditional formula is satisfied: R2(lambdaR)>R1(lambdaR), where R1(lambdaR) and R2(lambdaR) are a reflectance of said respective surfaces for light having a wavelength (lambdaR) falling within a range from 500 to 700 nm.
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