Question: You are working with an ELECTRICAL ENGINEER who wants to send you messages with his microwave antenna. The engineer points his antenna at a narrow window (width 37.0 cm) of your building and starts sending microwaves (wavelength 5.25 cm) your way.
A- What is the location of the first "dark" fringe on the wall 6.45 m from the window?
If possible just a brief explanation how you got the answer?