Determine the equation for single slit as bright fringes appear on the screen?

450 nm light from a Helium-Neon laser is incident on two tiny slits that are 6.5 μm apart, forming bright and dark fringes ona. screen 89 cm away. How far from the central bright fringe is the next bright fringe? Simplify your answer so that it doesn't have any trig functions in it.  PLEASE PLEASE draw the situation/diagram and define variables  Thank you!

A filter has two slits side-by-side. To measure the width of the slits and the distance between them, you decide to shine a laser and examine the interference pattern on a screen, x distance. - Derive an equation or expression that describes the location of the intensity maxima on a screen resulting from coherent light passing through two thin slits with a definite width and distance between the centers of the slits. Define the symbols used in your derivation using either text or a diagram. - Sketch a graph or diagram showing the light intensity pattern on the screen.  - What pattern would you expect to see on the screen if light from the two slits did not interfere? Sketch it and point out differences between the last

Establish the relevant theoretical model: Write an equation linking the distance between the two slits (d), the wavelength of the light source (2), the distance from the screen (L), the linear position (y) of the bright interference bangs and the order of these bangs (m). Use the small-angle approximation. Isolate, in this relationship, the linear position of the bright fringes. Draw a graph of y as a function of m.