one another.each of which reflected light to the screen. The light strikesthe screen exactly as if it came from the two images S, and S2,which may be thought of as replacing the two independent THE FRESNEL MIRRORS 45 slits Sx and S_, of figure 20. with the one important differ-ence that now… … s,-^ Figure 21 • Figure 22 This experiment works very satisfactorily, though the ad-justment is somewhat difficult, since the slit must be veryaccurately parallel to the line in which the planes of the twomirrors intersect. Figure 22 is a photograph of fringes takenby this method. The light used…
Light
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