Is it even possible to do so? I used a thick paper sheet with 1x5 mm slits 5mm apart with a normal flashlight (just to do a rough test). I saw what looked like the patches of light with darkness in between, but it was very, very faint.. Is it possible to do an effective model with easy-to-get materials? I live in a developing country, so I can't really get my hands on the things Young used. The most advanced thing I could possible get is a laser pointer as a light. I'm sorry if this is in the wrong section, I couldn't find the right section to ask this.