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wu :: forums    riddles    microsoft (Moderators: Grimbal, SMQ, towr, Eigenray, william wu, Icarus, ThudnBlunder)    Problme « Previous topic | Next topic » Pages: 1  Reply Notify of replies Send Topic Print    Author  Topic: Problme  (Read 2798 times) tuxilogy Newbie     Posts: 45 Problme   « on: May 14th, 2006, 1:37am » Quote Modify Imagine you are standing in front of a mirror, facing it. Raise your left hand. Raise your right hand. Look at your reflection. When you raise your left hand your reflection raises what appears to be his right hand. But when you tilt your head up, your reflection does too, and does not appear to tilt his/her head down. Why is it that the mirror appears to reverse left and right, but not up and down? IP Logged JocK Uberpuzzler     Gender: Posts: 877 Re: Problme   « Reply #1 on: May 14th, 2006, 3:03am » Quote Modify   http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=riddles_har d;action=display;num=1043170706     IP Logged solving abstract problems is like sex: it may occasionally have some practical use, but that is not why we do it. xy - y = x5 - y4 - y3 = 20; x>0, y>0. jwhooper Newbie     Posts: 5 Re: Problme   « Reply #2 on: Apr 30th, 2007, 12:23pm » Quote Modify The mirror is reflecting back the light waves bouncing from your body.  It isn't reversing anything. IP Logged Grimbal wu::riddles Moderator Uberpuzzler     Gender: Posts: 7526 Re: Problme   « Reply #3 on: May 1st, 2007, 4:35am » Quote Modify The reflected image is reversed as compared to the model.   But what is reversed is not the left and the right, it is the front and the back. IP Logged HiddenHeart Newbie     Gender: Posts: 24 Re: Problme   « Reply #4 on: Jan 17th, 2008, 4:18am » Quote Modify Let, you are standing on the positive xy plane and your head is towards the positive z axis. if the positive xz plane is the mirror then only the y axis is reflected on it. so the left seems right on the reflection. [someone might want a rigorous explanation of this which i skip here   ]     but if the xy plane was the mirror. that is if you are standing on a mirror then when you jump up. your image jumps down!   because this time the positive z axis is reflected.   only this time the "up is down' effect is observed.       « Last Edit: Jan 17th, 2008, 4:19am by HiddenHeart » IP Logged anglia Junior Member     Gender: Posts: 60 Re: Problme   « Reply #5 on: Aug 11th, 2015, 5:28am » Quote Modify There is only a one logic. Nothing is reversed in this. The light which is reflected from mirror is getting bounced from your body. IP Logged ebooks Pages: 1  Reply Notify of replies Send Topic Print Forum Jump: ----------------------------- riddles -----------------------------  - easy   - medium   - hard   - what am i   - what happened => microsoft   - cs   - putnam exam (pure math)   - suggestions, help, and FAQ   - general problem-solving / chatting / whatever ----------------------------- general -----------------------------  - guestbook   - truth   - complex analysis   - wanted   - psychology   - chinese « Previous topic | Next topic »

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