# Light and dispersion

## Homework Statement

Yellow light strikes a diamond at a 47.0° angle of incidence and is refracted when it enters the diamond. Blue light strikes a piece of flint glass and has the same angle of refraction as does the yellow light in the diamond. See Table 26.2 for data. What is the angle of incidence of the blue light?

Table 26.2
Approx. Color>Wavelength in Vacuum (nm)>Index of Refraction, n
Yellow>580>1.523
Blue>470>1.531

## Homework Equations

sin(angle1)n1=sin(angle2)n2

## The Attempt at a Solution

sin(47)*(1.523)=sin(angle)*(1.531)
sin(angle)=.7275321
angle=46.6799

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Argh, thought I knew what I was doing, apparently not

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grant9076
First, I assume that the 1.531 is the index of refraction of blue light in flint.

You have mixed the equations.
let x be the angle of refraction for both the diamond and the flint
let y be the angle of incidence in the flint.

sin(47)=x*1.523 for diamond
and
sin(y)=x*1.531 for flint

You now have 2 equations and 2 variables which you can solve.