Each pattern shown below would appear on a screen when monochromatic light first passes through a narrow slit of width a and then strikes a screen.The darkest areas on the page represent the brightest areas on the screen.In which case is the slit illuminated with light of the longest wavelength?

Question

Quizplus · Accepted Answer

The longest wavelength corresponds to the central maximum (brightest area) being the widest. In this case, the central maximum in pattern D is wider than the other options. Therefore, the slit illuminated with light of the longest wavelength is in pattern D.

Each Pattern Shown Below Would Appear on a Screen When