Timeline for How are we able to view an object in a room with bulb..?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Oct 19, 2011 at 16:40 | vote | accept | xyz | ||
| Oct 9, 2011 at 3:03 | comment | added | Mike Dunlavey | @p2pnode: Basically, unless a surface is a good mirror, it will reflect light in many/all directions. A substance like chalk is more like a Lambertian Reflector. Most surfaces are to some degree more like a mirror, to some degree more like chalk, and to some degree more like soot (not reflective). | |
| Oct 9, 2011 at 1:58 | comment | added | Kevin Reid | @Mike Dunlavey: That's only true if you're against a black background (which is presumably the case in the radar scenario); otherwise reflecting away means you're a black spot on the background. | |
| Oct 8, 2011 at 17:07 | comment | added | xyz | It's not obvious to me why in all cases, we should be able to cast a ray between the light source and the eye that bounces off the object, if I have to stick to the same reflection angle(as incidence angle). But, yeah it may be true considering that there will be surface aberrations resulting in many normals etc etc..any more detailed pointer on this? any link etc? Thanks! | |
| Oct 8, 2011 at 17:03 | comment | added | Mike Dunlavey | +1 Right. If the object was a good mirror, and the reflection was not to the eye, the object would be invisible. Stealth technology works that way. Don't let the radar get reflected back to the antenna. | |
| Oct 8, 2011 at 14:30 | history | edited | Richard Terrett | CC BY-SA 3.0 |
added 14 characters in body
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| Oct 8, 2011 at 14:24 | history | answered | Richard Terrett | CC BY-SA 3.0 |