When light passes from air into glass, it is refracted, as shown. Which expression has the same value as the refractive index of glass?
- A$\dfrac{\sin \theta_1}{\sin \theta_2}$
- B$\dfrac{\sin \theta_1}{\sin(90^\circ-\theta_2)}$
- C$\dfrac{\sin(90^\circ-\theta_1)}{\sin \theta_2}$
- D$\dfrac{\sin(90^\circ-\theta_1)}{\sin(90^\circ-\theta_2)}$