Light of wavelength $\lambda$ is directed normally onto a diffraction grating that has a total of $N$ lines across width $w$. A second order maximum is seen at a diffraction angle of $\theta$. What is the value of $N$?
- A$\frac{w\lambda}{\sin\theta}$
- B$\frac{2w\lambda}{\sin\theta}$
- C$\frac{w\sin\theta}{2\lambda}$
- D$\frac{w\sin\theta}{\lambda}$