Okay, so I've been thinking about diffraction experiments and light, but not having a laboratory, I would like to know some specifics about what happens in a diffraction experiment. I know that laser light diffracts when it passed through a narrow aperture, but does it diffract as it passes out the opening at the end of a laser? Does laser light diffract from a point in midair, if so can you detect it by looking at the laser beam at a small angle. Third question: Does the edge of the laser have to actually hit the sides of the slit to diffract or can it diffract when passing through a narrow aperture comparable to the wavelength of the incident light but still larger than the laser light diameter? Thanks for any help.