## University Physics with Modern Physics (14th Edition)

a. $n=\frac{c}{v}=\frac{3.00\times10^8m/s }{1.94\times10^8m/s }=1.55$. b. The wavelength in quartz is shorter by a factor of n. Find the wavelength in air. $$\lambda_q=\frac{\lambda_0 }{1.55}=355nm$$ $$\lambda_0=(1.55)(355nm)=550nm$$