Forty Rod SASS 3935 Posted November 17, 2021 Share Posted November 17, 2021 Does a prism have to be solid to make rainbows or could I make a hollow one 1" wide per side by 4" long and have it work? Seems like it should, but it's been 65 years since I had a class in Physics. Link to comment Share on other sites More sharing options...
Three Foot Johnson Posted November 17, 2021 Share Posted November 17, 2021 Ten seconds on Google indicates the answer is a hollow prism doesn't do anything - https://www.vedantu.com/question-answer/happens-when-white-light-passes-through-a-hollow-class-12-physics-cbse-5fc52813a763fc71fbc15fc9 Link to comment Share on other sites More sharing options...
John Kloehr Posted November 17, 2021 Share Posted November 17, 2021 I disagreed until I thought about it. And I did have to think about it. The reason a prism makes a rainbow is because the surface the light enters is not parallel to the surface the light exits. With the hollow prism, the light travels through a piece of glass with parallel surfaces, then back into air (the original ray of white light). This ray then enters another piece of glass with parallel surfaces and again exits this second piece of glass as a single ray. So no dispersion, and no deviation. If the result was anything other than this, we would not be able to see through a window at an angle, or a double-pane window. And even worse would be looking through two pieces of glass that were not parallel to each other. Link to comment Share on other sites More sharing options...
Charlie Harley, #14153 Posted November 17, 2021 Share Posted November 17, 2021 10 hours ago, John Kloehr said: I disagreed until I thought about it. And I did have to think about it. The reason a prism makes a rainbow is because the surface the light enters is not parallel to the surface the light exits. With the hollow prism, the light travels through a piece of glass with parallel surfaces, then back into air (the original ray of white light). This ray then enters another piece of glass with parallel surfaces and again exits this second piece of glass as a single ray. So no dispersion, and no deviation. If the result was anything other than this, we would not be able to see through a window at an angle, or a double-pane window. And even worse would be looking through two pieces of glass that were not parallel to each other. What John said. When light enters a pane of glass with two parallel sides, it starts to bend and color separate as it enters one side, but as it leaves the other parallel side it bends equally in the opposite direction, bringing the separated colors back together to their original hue. A hollow prism is just three panes of glass, all of which have parallel sides. Link to comment Share on other sites More sharing options...
Okiepan Posted November 17, 2021 Share Posted November 17, 2021 To me the best prism I have ever seen was 1973s Dark Side of the Moon . Link to comment Share on other sites More sharing options...
Forty Rod SASS 3935 Posted November 17, 2021 Author Share Posted November 17, 2021 14 hours ago, John Kloehr said: I disagreed until I thought about it. And I did have to think about it. The reason a prism makes a rainbow is because the surface the light enters is not parallel to the surface the light exits. With the hollow prism, the light travels through a piece of glass with parallel surfaces, then back into air (the original ray of white light). This ray then enters another piece of glass with parallel surfaces and again exits this second piece of glass as a single ray. So no dispersion, and no deviation. If the result was anything other than this, we would not be able to see through a window at an angle, or a double-pane window. And even worse would be looking through two pieces of glass that were not parallel to each other. That's a simpler explanation. Thanks. Link to comment Share on other sites More sharing options...
Wallaby Jack, SASS #44062 Posted November 18, 2021 Share Posted November 18, 2021 ...... so, you're not asking about the facilities that they put bad/naughty people into after the "guilty" verdict, are you ? Link to comment Share on other sites More sharing options...
Forty Rod SASS 3935 Posted November 18, 2021 Author Share Posted November 18, 2021 Nope. That's a pristine. Link to comment Share on other sites More sharing options...
Wallaby Jack, SASS #44062 Posted November 18, 2021 Share Posted November 18, 2021 6 hours ago, Forty Rod SASS 3935 said: Nope. That's a pristine. ...... right .... ; thanks, I've learned something new today .... Link to comment Share on other sites More sharing options...
Marshal Mo Hare, SASS #45984 Posted November 18, 2021 Share Posted November 18, 2021 All my neighbors have their blinds closed all the time. I like at least a semblance of daylight. My daughter suggested window film. I got one that was like frosted glass. Next I got one that was like hundreds of small prisms. it’s spectacular with some lighting as well as sunlight. Link to comment Share on other sites More sharing options...
Wallaby Jack, SASS #44062 Posted November 18, 2021 Share Posted November 18, 2021 6 hours ago, Marshal Mo Hare, SASS #45984 said: All my neighbors have their blinds closed all the time. ........... ..... you all walk around inside your houses naked, or something ? Link to comment Share on other sites More sharing options...
Marshal Mo Hare, SASS #45984 Posted November 18, 2021 Share Posted November 18, 2021 26 minutes ago, Wallaby Jack, SASS #44062 said: ..... you all walk around inside your houses naked, or something ? They are just afraid of someone watching them. I will let them look but the images will be distorted, as if the originals weren’t bad enough. Link to comment Share on other sites More sharing options...
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