用衍射法测量的薄带按下式计算:b=±(kλ)/(sinψ)_k)式中:k——衍射暗纹的级数;λ——光波波长,等于0.6328微米;ψ_k——第 k 级衍射角。当观测衍射图形的屏到带之间的距离 L 为足够 The band measured by the diffraction method is calculated as follows: b = ± (kλ) / (sin ψ) _k) where: k is the order of the diffraction obscure; λ is the wavelength of the light wave, which is equal to 0.6328 μm; K-th diffraction angle. The distance L between the screen and the band when the diffraction pattern is observed is sufficient