I am tutoring a high school student in physics, and struggling to find a good explanation as to why the interference pattern from a diffraction grating has thinner maxima compared to a double slit.
Does anyone have an explanation of this that an average high school physics student could understand? The content they have covered just includes the basics of Young's double slit experiment - no single slit interference or mathematical derivations of the interference equation ($d \sin \theta = n \lambda$). An ideal explanation would include very little maths (ideally none), and be somewhat intuitive to understand. Cheers