Is there any way to perform the double slit experiment and see the interference pattern without using a laser? If so, what type of light do you need?
What do you mean by chromatic?As far as I understand it- the light need not be chromatic at all.
As for how to do it.. collimate the light by letting it pass through a very narrow gap (say, between two razor blades). Then have it go through another such gap, or your double slit perhaps. You may need some kind of lens to appreciate the pattern. Works fine with a normal battery torch.. well.. actually it's a pain because you likely need a dark room to be able to see the small amount of light involved, and you need to block out the extra torchlight.. it's fiddly.