As I believe I stated in my previous post I was looking into some mathematics to calculate the angle of the glass that should go in front of the Tic-Tac box.
After some thinking I derived a formula: angle = atan( - (1,33 * sin( desired_angle )/(1 - 1,33 * cos( desired_angle )))
To make it easy to calculate more angles, I made a python function. Here are some calculations results:
|Wanted deflection angle||Glass angle|
|5 deg||6,65 deg|
|10 deg||13,3 deg|
|15 deg||19,95 deg|
|20 deg||26,6 deg|
|25 deg||33,25 deg|
|30 deg||39,9 deg|
|35 deg||46,55 deg|
|40 deg||53,2 deg|
|45 deg||59,85 deg|
|50 deg||66,5 deg|
|55 deg||73,15 deg|
|60 deg||79,8 deg|
|65 deg||86,45 deg|
|70 deg||Not possible. Angle greater than 90|
I may buy a Lazer to test the results above. One concern I have is whether the refraction will split the light into the different colours. Hopefully this will be negligible.
Anyway I'll try making a Tic-Tac box with angled glass and test it out to see if it works
PS: Note this will only work when the inside of the Tic-Tac box is dry and the angled glass on the Tic-Tac box is submerged in water!