It might be to review any important points in the description of the setup here (see figures 1 and 2). in this experiment, we send light through (1) a collimator slit and collimator lens, (2) a fine diffraction grating, (3) a focusing lens, (4) an aperture disk, and finally (5) a light sensor. the collimators serve to change the original beam shape to a rectangular shape with sharp edges, i. e., collimated. the slit should be set to the smallest size, slit 1 for this experiment. the collimating lens the beam keep its size and shape over the distance it must travel to the light sensor. the diffraction grating diffracts the beam of light. you have seen what happens when light is diffracted in a previous lab. in particular, the light waves spread out and interfere with each other so that if we allow the resulting light to fall on a surface, we see there are locations where there are maxima and minima. what is the equation for determining bright spots from the diffraction grating? experiment with the placement of the focusing lens so that the lamp light is focused on the aperture in front of the light sensor.