A beam of light is composed of two wavelengths, $436\,\text{nm}$ and $654\,\text{nm}$. A diffraction grating with $5.00 \times 10^{5}\,\text{lines m}^{-1}$ forms a diffraction pattern in which the second order for one wavelength appears at the identical angle $\theta$ as the third order for the other wavelength. What is the angle $\theta$?
- A$19.1^{\circ}$
- B$25.8^{\circ}$
- C$40.8^{\circ}$
- D$78.8^{\circ}$