Science Buddies: "Ask an Expert"

Hi,

Im thinking of doing a study on the effects of chemical temperature on the quality of holographic development. The problem is, there are too many variables, it seems, in the exposure of holograms. There is the power of the laser, mirror angles, vibrations, that would all have to be taken into account. any ideas? thanks.

<<i originaly wanted to do the study on the power of the laser, but havent been able to find more than one He-Ne laser.>>

All you need to do is to keep the other variables the same. These are called controls. If all of your controls are the same, then you have a controlled experiment changing only the temperature.

Good luck