cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Optical Illusion....Explain This!

scj7129
Contributor

Greetings All!

 

Here is an optical illusion I would like to hear some opinions about. The photo was taken by myself.

 

It is a picture of one of three legs of a clocktower. The legs are curved down and outwards.

 

The reflection that you are seeing in the leg, is a reflection of the top of the clocktower....twice!

 

Once facing towards the top and one facing downwards.

 

There appears to be a "joining" of the two images in the middle.

 

The question is...."WHY?"

 

Any takers?!

 

Clocktower Leg-BW2.jpg

4 REPLIES 4

WahoGT
Enthusiast

The shiny curved surface is acting like a concave mirror (googe concave mirror physics for a detailed explanation with photos).  It has to do with how the curved surface reflects light rays to a focal point, past which the reflected image becomes inverted.  I'm guessing you were near this focal point, and the varied curvature of the upper and lower portion of the reflective surface in relation to you (the lower portion is closer than the rear and at a steeper angle) caused the upper portion of the surface to be on one side of the focal point and appear upright, while the lower surface is on the other side of the focal point causing it to be inverted.

Nicely done, this gave me a physics flashback!!

COOL!..... To really "see" this effect, I had to stand on the concrete base that the leg was mounted to, which was probably a good 24" off the ground!....Standing on the ground, the effect was not visible!

WahoGT
Enthusiast

Here's a youtube demonstration showing how the image flips based on whether or not you're inside or outside the focal point.

 

Mirror video

http://www.youtube.com/watch?v=NuFjqPEXG_4

 

Mathematical Explanation

http://www.youtube.com/watch?v=BmHK25Mts3I

Announcements
09/19/2022: New firmware version 1.0.4.1 is available for EOS C70
08/31/2022: New firmware version 1.1.1 is available forRF 70-200mm L IS USM
08/09/2022: New firmware version 1.2.0 is available for CR-N 300
08/09/2022: New firmware version 1.2.0 is available for CR-N 500
07/28/2022: New firmware version 1.2.1 is available for EOS-R3
07/21/2022: New firmware version 1.6.0 is available for EOS-R5
07/21/2022: New firmware version 1.6.0 is available for EOS-R6
07/21/2022: New firmware version 1.1.0 is available for EOS-R7
07/21/2022: New firmware version 1.1.0 is available for EOS-R10
07/14/2022: New firmware version 1.0.1 is available for CR-X300
07/01/2022: New firmware version 1.3.0 is available for PowerShot PICK
06/10/2022: Service Notice:UPDATE: Canon Inkjet Printer continuous reboot loop or powering down
06/07/2022: New firmware version 1.3.2 is available for PowerShot G7 X Mark III
06/07/2022: New firmware version 1.0.3 is available for EOS M50 Mark II
05/31/2022: Did someone SAY Badges?
05/26/2022: New firmware version 1.0.5.1 is available for EOS-C500 Mark II
05/26/2022: New firmware version 1.0.3.1 is available for EOS-C300 Mark III
05/10/2022: Keep your Canon gear in optimal condition with a Canon Maintenance Service
05/05/2022: We are excited to announce that we have refreshed the ranking scale within the community!
04/26/2022: New firmware version 1.0.1.1 is available for EOS R5 C
03/23/2022: New firmware version 1.0.3.1 is available for EOS-C70
02/09/2022: Share Your Photos is back!
02/07/2022: New firmware version 1.6.1 is available for EOS-1DX Mark III
01/19/2022: READY FOR ANYTHING EOS-R5 C
01/13/2022: Community Update. We will be retiring the legacy profile avatars on 01/20/2022. Click this link to read more.
01/05/2022: Welcome to CES 2022!