A diffraction grating is illuminated normally by light with wavelength $5.30 \times 10^{-7}\,\text{m}$. The first-order maximum is seen at an angle of $15.4^\circ$ to the direction of the incident light. What is the angle between the first-order and second-order diffraction maxima?
- A$7.7^\circ$
- B$15.4^\circ$
- C$16.7^\circ$
- D$32.1^\circ$