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Distance based opaque to transparent behaviour
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[QUOTE="deval vyas, post: 5502712, member: 566480"] Thanks a lot for your feedback Simon and Sophie. My one way mirror analogy was not correct I guess... [USER=133292]@Sophie[/USER]: By opaque I meant that the surface should scatter light in all the directions so that when I look at that surface all I see is a white surface-Something like a sand blasted glass or translucent coated glass. I should not be able to see what is behind that surface unless I touch it from behind. Say I have a transparent plastic or acrylic sheet which has two surfaces - A and B. What I am looking for is a manner in which I can make one surface-(A) of that sheet look opaque white (by light scattering) But when I touch or say press opposite surface (B) of that sheet, with any other another object say my hand then the light scattering should not happen at all and I should very clearly-in full fidelity- be able to see my hand from surface A . Again if I take my hand off that opposite surface (B) I should only be able to see white surface (A). this should keep on happening and its not a one time thing. Also, the object touching the opposite surface can't be any fluid or water--it has to be a solid. I was thinking on lines of very small micro lens array or pimpled surface that could do that by TIR of light. Then if I brought any other object very near that lens it could cancel out the TIR by Frustrated total internal reflection there by allowing the light to pass again. But TIR is very angle dependant. Only light falling at certain angles will be reflected back and not all the light will be reflected back. So I will still get some transparency when viewed from certain angle. But this is my guess...not very sure...here I am looking at 180degrees angle of view. [USER=3145]@simon[/USER]: can you please let me know if there are any surfaces which will block or scatter visible light unless an object is touching it from behind. I guess I am looking for a way to make " touch activated opaque (or scattering) to transparent surface..." I am attaching a picture and video of "fibre optic plate" which "seems to behave" this way..at least in below pic and video on you tube. however these are extremely costly things and I am looking for some thing I can buy from local market or a diy kind of thing...Please look at this video below. its of fiber optic plate or compressed fiber lens Here it seems that the object- which is the book or letters here, is visible only when the plate is touching the letters. Once the lens is lifted, it behaves as though its opaque. [URL='https://www.youtube.com/watch?v=PUlow0-5pWU'][U]https://www.youtube.com/watch?v=PUlow0-5pWU[/U][/URL] Even the picture of the same fiber optic plate in hands behaves similarly- at-least while looking at its picture. Here too, only the finger print or the ridges of the finger print that are on physical contact with the plate are visible as though the fiber optic plate is transparent. The rest of the finger is almost not visible. [URL='http://hpi.de/fileadmin/user_upload/fachgebiete/baudisch/projects/3d_tracking/fiberio/2013-uist13-fiberio-fingerprint_faceplate.jpg'][U]http://hpi.de/fileadmin/user_upload/fachgebiete/baudisch/projects/3d_tracking/fiberio/2013-uist13-fiberio-fingerprint_faceplate.jpg[/U][/URL] It seems that the fibre optic plate behaves as opaque plate or very translucent till the object touches the plate. I am looking for something similar with 180 degrees angle of view... [/QUOTE]
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