The class is about heat, waves, and light. The website wants exactly the perfect answer and in the same metric system units that are stated on the calculators that are on the picture for the question, if not, it'll mark it wrong.

Set 16 Problem 1 Light of wavelength 679 nm falls on two slits and produces an interference pattern in which the fourth-order bright fringe is 36 mm from the central fringe on a screen 2 m away. What is the separation d of the two slits? For small angles, 3 = tan 8 = sin 3, approximately