Light of wavelength 6.0×10−7m is incident on two parallel slits.
The graph shows the variation with diffraction angle θ of the intensity I of light observed on a screen far from the slits. I0 is the intensity of light on the screen due to one slit only.
- Identify a feature of this graph that suggests that the slit width is not negligible. [1]
- Estimate the slit width. [2]
- Outline how the central maximum is formed. [3]
- Explain why the intensity of the central maximum is equal to 4I0. [2]
