Editing Talk:1145: Sky Color
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Of course with '''''vertical''''' mirror vertical axis is selected: perceived switching of left and right (really close with far to mirror surface). When '''standing on''' '''''horizontal''''' mirror we will perceive switching bottom from top. --[[User:JakubNarebski|JakubNarebski]] ([[User talk:JakubNarebski|talk]]) 09:09, 10 December 2012 (UTC) | Of course with '''''vertical''''' mirror vertical axis is selected: perceived switching of left and right (really close with far to mirror surface). When '''standing on''' '''''horizontal''''' mirror we will perceive switching bottom from top. --[[User:JakubNarebski|JakubNarebski]] ([[User talk:JakubNarebski|talk]]) 09:09, 10 December 2012 (UTC) | ||
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:If the part you added was "mirrors don't reverse things, turning around does", then I think that that is the best description. If you can see text in a mirror, then that means that you have turned away from the text. And normally, humans turn around the z-axis. If, rather than <i>turning away</i> from a sign to look at a mirror on the opposite wall, you instead somersaulted backward into a handstand, then you would see the sign reversed vertically instead of horizontally. [[Special:Contributions/108.162.249.76|108.162.249.76]] 22:33, 5 November 2017 (UTC) | :If the part you added was "mirrors don't reverse things, turning around does", then I think that that is the best description. If you can see text in a mirror, then that means that you have turned away from the text. And normally, humans turn around the z-axis. If, rather than <i>turning away</i> from a sign to look at a mirror on the opposite wall, you instead somersaulted backward into a handstand, then you would see the sign reversed vertically instead of horizontally. [[Special:Contributions/108.162.249.76|108.162.249.76]] 22:33, 5 November 2017 (UTC) | ||
− | Easier way to describe it: Imagine you hold a piece of | + | Easier way to describe it: Imagine you hold a piece of glas. Write on the glass and hold it in front of the mirror, so that you can see both the original text and the mirrored text. Both versions of the text will look identical. So the mirror doesn't change anything. [[Special:Contributions/62.220.2.194|62.220.2.194]] 11:10, 10 December 2012 (UTC) |
Another way: draw a line between the real object and its reflection. Things are reflected around that line. If that line is going up & down (relative to your eyes), then things are reflected left/right (relative to your eyes). If that line is horizontal (again relative to your eyes), then things are reflected top/bottom. So it's not so much whether the mirror is horizontal or vertical, but rather what direction you are looking into the mirror (although that can be influenced a lot by the mirror's orientation).[[User:CityZen|CityZen]] ([[User talk:CityZen|talk]]) 04:17, 11 December 2012 (UTC) | Another way: draw a line between the real object and its reflection. Things are reflected around that line. If that line is going up & down (relative to your eyes), then things are reflected left/right (relative to your eyes). If that line is horizontal (again relative to your eyes), then things are reflected top/bottom. So it's not so much whether the mirror is horizontal or vertical, but rather what direction you are looking into the mirror (although that can be influenced a lot by the mirror's orientation).[[User:CityZen|CityZen]] ([[User talk:CityZen|talk]]) 04:17, 11 December 2012 (UTC) | ||
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I always wonder: Since the sky goes from red to blue to red and the optical spectrum goes from red to green to blue. How come the sky is never green? | I always wonder: Since the sky goes from red to blue to red and the optical spectrum goes from red to green to blue. How come the sky is never green? | ||
: Because of human color perception. You only perceive green in polychromatic light when said light is stronger in the middle wavelengths than the low or high wavelengths; in other words, you would need a process in the sky that removed ''both'' the high and low wavelengths from white light. As the sun sets, only the lower wavelengths are removed, so you perceive yellows and reds -- this perception of color is "one-sided", i.e. it is not interfered with by even longer wavelengths. By the way, sometimes you do see green briefly in the sky, it's called a [http://en.wikipedia.org/wiki/Green_flash Green Flash]. --[[User:Prooffreader|Prooffreader]] ([[User talk:Prooffreader|talk]]) 16:41, 10 December 2012 (UTC) | : Because of human color perception. You only perceive green in polychromatic light when said light is stronger in the middle wavelengths than the low or high wavelengths; in other words, you would need a process in the sky that removed ''both'' the high and low wavelengths from white light. As the sun sets, only the lower wavelengths are removed, so you perceive yellows and reds -- this perception of color is "one-sided", i.e. it is not interfered with by even longer wavelengths. By the way, sometimes you do see green briefly in the sky, it's called a [http://en.wikipedia.org/wiki/Green_flash Green Flash]. --[[User:Prooffreader|Prooffreader]] ([[User talk:Prooffreader|talk]]) 16:41, 10 December 2012 (UTC) | ||
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This sentence doesn't make sense: "(from "his" right to left instead of from "his" left to right)" [[User:Trek7553|Trek7553]] ([[User talk:Trek7553|talk]]) 15:15, 10 December 2012 (UTC) | This sentence doesn't make sense: "(from "his" right to left instead of from "his" left to right)" [[User:Trek7553|Trek7553]] ([[User talk:Trek7553|talk]]) 15:15, 10 December 2012 (UTC) | ||
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: If you look at the response curve (middle of cited page) you'll see that red receptors have two peaks, one in the red wavelengths, and another (very tiny one) in the violet. That's why purple (which is red + blue) looks so similar to violet, and why the "color wheel" works. [[Special:Contributions/207.225.239.130|207.225.239.130]] 21:59, 11 December 2012 (UTC) | : If you look at the response curve (middle of cited page) you'll see that red receptors have two peaks, one in the red wavelengths, and another (very tiny one) in the violet. That's why purple (which is red + blue) looks so similar to violet, and why the "color wheel" works. [[Special:Contributions/207.225.239.130|207.225.239.130]] 21:59, 11 December 2012 (UTC) | ||
:: PS: "first years" is an idiom. Wouldn't that be "first year students" to be proper English? [[Special:Contributions/207.225.239.130|207.225.239.130]] 22:05, 11 December 2012 (UTC) | :: PS: "first years" is an idiom. Wouldn't that be "first year students" to be proper English? [[Special:Contributions/207.225.239.130|207.225.239.130]] 22:05, 11 December 2012 (UTC) | ||
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