Camera obscura

A quarter circular room is covered with mirrors. A ray of light is emitted from one corner and reflected somewhere on the opposite wall, then on the arc, before reaching the adjacent wall at a point a distance a from the light source and b from the circle centre. What is the maximum of a/b?

Scroll down for a solution to this problem.


The maximum of a/b is 2.

Solution by 発音 た゜.


Camera obscura
Let’s enter in this black room
To study eclipses of the moon
Protect your eyes from the sun
And look at the sky to have fun
Is there a secret in this camera obscura?
May be for the eyes in a mysterious area
Between light and shadows
An inverted image from a rainbow


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