![]() The actual experiment was incidental, but I caught a glimpse of it and was intrigued. One of the problematic experiments had a rather large static laser, some smoke to see the beam, a screen and lots of what you might call ‘proper’ equipment. ![]() In high school physics lessons they tend to use a laser as the coherent source, and highly expensive engineered twin slit gizmos that the physics teacher gets really upset about if it goes missing.Ī couple of weeks ago I was at a film-making workshop and somebody showed a clip that was meant to demonstrate the problems of lighting labs for camera. Traditionally this involves a pinhole and an incoherent source (which is not what necessarily you put on your kebab after a hard night’s drinking)-hence the S 0 in the above diagram-and a lens to refocus the whole shebang. ![]() Even in three dimensions.įor this to work however, you generally need a coherent light source. I was going to draw a diagram but as usual, somebody on the internet has already done it for me. This is quite easy to understand, if you’re at all familiar with the movement of waves upon water: when a wave (of water or light) hits a barrier in which there is a small aperture, you get waves spreading out from the other side of the barrier.īut if you have two apertures (or slits) in the barrier, then the two waves interfere with each other, and you get a well-known pattern. Physics teachers demonstrate the wave nature of light using the double-slit, or Young’s, experiment. I said only if she was really really small.) (The Younger Pawn asked if she could surf on light, if it was a wave. One of the least strange physical phenomena is that light behaves like a wave.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |