I observe two phenomena:
Obs-1: I don't have the materials here to perform this experiment.
Obs-2: You have not done the assigned experiment, and you apparently have no intention of doing it.
It's important to know that diffraction gratings can be identified by the number of lines they have per centimeter. Often, more lines per centimeter is more useful because the images separation is greater when this happens. That is, the distance between lines increases.
<h2>Therefore, the answer is 2.</h2>
The density of ice is less than the density of water. C
Build walls around the coast
