You'd think I could figure this out based on the answers to the previous crab-color questions, but I can't. Q. Nellie Newton wishes to "tag" a blue crab with a red laser pointer...She is standing on a pier. The crab is down in the seawater. Should she aim the pointer ABOVE where she thinks the crab is, DIRECTLY AT the crab, or BELOW where she sees it? I was thinking ABOVE where she thinks she sees it, because usually, if you were going to spear it, with an actual spear, you'd aim BELOW it. But with the red light being so weak in the seawater, maybe you have to aim it ABOVE in order to get any to the crab. Plus, the crab being blue, doesn't that mean it is bending the light away from her as it comes out the water? And the red bends DOWN? Any help appreciated. I just got back from the E.R. with my poor eyes, I can't actually do this experimentally, they are practically swollen shut (see what studying physics does to a person?). Hope I am typing this correctly.