2'=4.34×10-12m A元='-元= 2h sin mc 2 △2moc =0.543 2 2h 0=65.7° END2 sin 2 2 0 ϕ λλλ cm h =Δ ′ =− h cm 22 sin ϕ λΔ 0 = = 543.0 ϕ 7.65 °= END m1034.4 −12 λ′ ×=