A laser shines through a single slit of unknown width \(a\text{.}\) You observe at least one dark spot on a distant screen. Is the width of the slit greater than, less than, or equal to the wavelength of the laser?
You now have two models for light: a ray model (which may also be thought of as a particle model) and a wave model. Briefly compare and contrast key features of these models. Does it make sense to you that light sometimes behaves like a wave and sometimes behaves like a particle?
