Optical Illusions and Parabolic Ghosts

March 30, 2019

 

[S2 Maths Topic: Graphs & Quadratic Equations] Optical illusions. They are a rare occurrence in Nature, and sometimes observed over deserts in the form of mirages, or the Brocken spectre when the sun casts your own shadow among moving clouds to name a few.

 

But with the help of Physics (and Maths), we can recreate a "mirage" [Parabolic Ghost] of an object by placing it carefully between two special, non-Euclidean convex mirrors.

 

A Do-It-Yourself mirage? How does it work? Professor Burkard Polster works out the mathematics behind the phenomenon so that you can try to make one yourself.

 

(Hint: Some old flashlight heads have the perfect geometry to replicate the [y = x^2] shape depicted in the video. Look around your house for one!) 

 

The Secrets of Parabolic Ghosts

Please reload

Featured Posts

I'm busy working on my blog posts. Watch this space!

Please reload

Recent Posts

May 12, 2020

April 14, 2020

April 8, 2020

February 18, 2020

January 29, 2020

January 28, 2020

January 22, 2020

Please reload

Archive