A hydrogen discharge lamp emits light with two prominent wavelengths: 656 nm (red) and 486 nm (blue). The light enters a flint-glass prism perpendicular to one face and then refracts through the hypotenuse back into the air. The angle between these two faces is 35?.a. Use Figure 35.18 to estimate to ?0.002 the index of refraction of flint glass at these two wavelengths.

b. What is the angle (in degrees) between the red and blue light as it leaves the prism?

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n increases as A decreases. n 1.62 1.60- Flint glass 1.58 - UV 1.56 IR 1.54 - 1.52- Crown glass 1.50 + A (nm) 800 300 400 500 600 700