1. The problem statement, all variables and given/known data Got a question in a school examination, but here's the part I want to ask. How does the number of slits per unit length, affect the intensity of the diffraction pattern? What I do know is that the finer the slit separation, the wider the angle opens up. But intensity is against per unit area.... Any formula I should be looking at? I have only got d*sinθ=nλ Level: Cambridge GCE Advanced Level ------------------ I thought that since, on average 50% of the light hits the material, 50% of the light passes through the slit, the intensity should be unchanged regardless of how fine the grating is ruled.