Chapter 30, Problem 66P

For common materials like glass, the wavelength dependence of the refractive index at visual wavelengths is given approximately by n(λ) = b + c/λ², where b and c are constants. The table below gives values of λ and n for the crown glass of Example 30.4. Determine a quantity that, when you plot n against it, should give a straight line. Make your plot, establish a best-fit line, and use the line to determine the constants b and c.

λ (nm)	425	475	525	575	625	675
n	1.534	1.528	1.523	1.521	1.518	1.517