Summary: This learning object is a question involving double slit interference, where D and d must first be found to discover the amount of bright fringes present. It is in the format of a word problem.

https://docs.google.com/document/d/1TYxMCe1LeOOWaELoH33-xW0Ha9kb2DSeySbtgG6QKAk/edit?usp=sharing