createCanvas(800, 600);

  background(255);

}

​

function draw() {

  background(255);

  let lightSource1 = createVector(width / 3, height / 2);

  let lightSource2 = createVector(2 * width / 3, height / 2);

  let objectPos = createVector(width / 2, height / 3);

​

  stroke(0);

  line(lightSource1.x, lightSource1.y, objectPos.x, objectPos.y);

  line(lightSource2.x, lightSource2.y, objectPos.x, objectPos.y);

​

  fill(255, 0, 0);

  ellipse(lightSource1.x, lightSource1.y, 10, 10);

  ellipse(lightSource2.x, lightSource2.y, 10, 10);

​

  fill(0, 255, 0);

  ellipse(objectPos.x, objectPos.y, 10, 10);

​

  // Calculate and display interference pattern

  let plateY = 2 * height / 3;

  for (let x = 0; x < width; x++) {

    let d1 = dist(lightSource1.x, lightSource1.y, x, plateY);

    let d2 = dist(lightSource2.x, lightSource2.y, x, plateY);

    let interference = sin(d1 / 10) + sin(d2 / 10);

    let brightness = map(interference, -2, 2, 0, 255);

    stroke(brightness);

    point(x, plateY);

  }

}

​