The next puzzle in Indiana Jones and the Great Circle is also part of the storyline. It becomes available after you have found the entrance to the catacombs under the Great Pyramid and solved the Resonance Chamber puzzle.
It awaits you behind a door that needs to be opened using sunlight and a mirror. First, inspect the left part of the room to find an relic kuno.
Return to the only available mirror and direct the light to the symbol in the upper right corner. A passage to another mirror will open on the left. Go there and direct the light to the reflective bowl in the main hall.
Now, with two beams, direct one to the image in the upper left corner and the other to the symbol in the center right. The opposite door will open, behind which you will find the missing mirror.
With three beams of light, all that remains is to correctly connect the symbols and open the gate. For convenience, use our screenshots.