| 摘要 |
An anti-reflection film having quite a low reflectivity comprises a transparent substrate and first to N-th layers formed thereon, wherein, when the optical admittance of the interface between the N-th layer and (N-1)-th layer is represented by (x+iy), x and y satisfy the following inequality: 0.9x[(n2-n02)/2n0]2<[x-(n2+n02)/2n0]2+y2<1.1-[(n2-n02)/2n0]2 wherein n0 is the refractive index of the region outside the outermost layer (such as air or adhesive), and n is the refractive index of the outermost layer (the N-th layer).
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