What Is the Minimum Radius Needed to Paint on a Cube to Contain Light?

AI Thread Summary
To prevent light from escaping a glass cube with a side length of 16.0 cm, a circle must be painted on each face. The minimum radius of the circle is determined by the principles of total internal reflection, which dictate how light behaves at the interface of different media. The calculations involve the geometry of the cube and the angles of incidence and reflection. Without specific calculations provided, it's essential to apply the relevant formulas from optics to find the exact radius needed. Understanding these principles is crucial for effectively containing light within the cube.
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Lets say you got a glass cube and a small light source embedded at the exact center of the glass cube.
Now if you want to paint a circle on each face of the cube so that the light is prevented from leaving the cube, what is the minimum radius of the circle that you need to paint?

Let say each of the sides of the cube is 16.0cm.

Thanks!
 
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