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Newton's rings. A planoconvex lens rests on a flat glass surface. Light of wavelength À falls normal to the plane surface (Figure 11-35). (a) Find the spacing d as a function r, the radial position. Assume R (curvature radius) R >> r. (b) Show that bright interference fringes are located at the positions given by - [(m + ₂2) R₂ ] I, = where m is an integer.

Newton's rings. A planoconvex lens rests on a flat glass surface. Light of wavelength À falls normal to the plane surface (Figure 11-35). (a) Find the spacing d as a function r, the radial position. Assume R (curvature radius) R >> r. (b) Show that bright interference fringes are located at the positions given by - [(m + ₂2) R₂ ] I, = where m is an integer.

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7. Newton's rings. A planoconvex lens rests on a flat glass surface. Light of wavelength falls normal to the plane surface (Figure 11-35). (a) Find the spacing d as a function r, the radial position. Assume R (curvature radius) R >>> r. (b) Show that bright interference fringes are located at the positions given by 1 = [(-+)] where m is an integer. Air Glass Glass FIGURE 11-35 Problem 7. R 1/2 d(r)
Transcribed Image Text:7. Newton's rings. A planoconvex lens rests on a flat glass surface. Light of wavelength falls normal to the plane surface (Figure 11-35). (a) Find the spacing d as a function r, the radial position. Assume R (curvature radius) R >>> r. (b) Show that bright interference fringes are located at the positions given by 1 = [(-+)] where m is an integer. Air Glass Glass FIGURE 11-35 Problem 7. R 1/2 d(r)
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