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当薄膜的厚度适当时,在薄膜的两个面上反射的光,路程差恰好等于半个波长,因而互相叠加后抵消,这就大大减少了光的反射光的损失,从而增强了透射光的强度。
When the thickness of the film is appropriate, the difference in the light reflected on the two faces of the film is exactly equal to half the wavelength, so that they are superimposed and cancel each other, which greatly reduces the loss of reflected light of the light and enhances the transmitted light strength.