Question

Two-slit Fraunhofer diffraction II

A two-slit Fraunhofer interference-diffraction pattern is observed with light of wavelength 600 nm. The slits have widths of 0.06 mm and are separated by 1.02 mm. How many bright fringes will be seen inside the central diffraction maximum?

Answer 1

could someone explain where I should start with this problem

Answer 2

First step would be to use less gibberish.