[list=1][*]With a marker make red zebra stripes on graph paper. Use alternating columns so that the colored bands are the same width as the white regions between them. As an alternative you can use the ones below with an adjustable spacing.[/*][*]Take the pattern outside on the balcony and while your group members are observing the pattern, walk backward until they can no longer discern that the pattern has gaps in it. It should look like a continuous colored stripe. [/*][*]Calculate the angular separation between the stripes at which that occurred, and compare with Rayleigh's criterion by percentage difference.[/*][*]Do the same with blue zebra stripes.[/*][*]Observe the two red LEDs and find out how far you need to be from them such that they look like a single source of light. The wavelength of the LEDs is 660nm. Their inside edges are separated by 3mm.[/*][*]Observe pixels on a cellphone screen under a microscope. Draw what you saw, and explain the choice of colors used in the context of biology.[/*][*]Observe the color print ad and explain why the same colors are not used in print ads as on phone screens. [/*][/list]