The diagram illustrates visible light falling normally on a diffraction grating. An intensity pattern with maxima is formed on the screen. A line joining the centre of the fourth order intensity maximum to the centre of the diffraction grating makes an angle of $53^\circ$ with the centre line. The grating has a line spacing of $2.7 \times 10^{-6}\,\text{m}$. What is the wavelength of the incident light?
- A$4.1 \times 10^{-7}\,\text{m}$
- B$5.4 \times 10^{-7}\,\text{m}$
- C$1.6 \times 10^{-6}\,\text{m}$
- D$2.2 \times 10^{-6}\,\text{m}$