18. Using the same notation found in Sample Problem 36-3, DLd==θR122.λwhere we will assume a “typical” wavelength for visible light: λ≈550 ×10–9m. (a) With L= 400 ×103m and D= 0.85 m, the above relation leads to d= 0.32 m. (b) Now with D= 0.10 m, the above relation leads to
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