So far my friends and I figured out that we will take a solution of chlorophyll, carotene and something else, then place it between white light and prism to see the spectrum on a screen. For a physical part of this experiment (there are also chemical and biological), we want to take photos of it, show which colors will be reflected and which the most. However my physics teacher said it can be accepted but it is not very ambitious. My idea is also to measure the percent absorption spectrum of particular substances, then draw a graph wavelength vs. percent absorption, but do You maybe know what device can be used to do it? Do You have any other ideas to make the experiment better?