Reflection of Light: Solving Physics Problem on Glass Cube Surface Coverage

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SUMMARY

The discussion centers on a physics problem involving a solid glass cube with an edge length of 10 mm and a refractive index (n) of 1.5. The task is to determine which parts of the cube's faces must be covered to ensure that a central spot is not visible from any viewing angle, as well as to calculate the fraction of the surface area that needs to be covered. Key insights include understanding the principles of light reflection and refraction, which dictate visibility based on the observer's angle.

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  • Understanding of light reflection and refraction principles
  • Familiarity with geometric optics
  • Knowledge of surface area calculations
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This discussion is beneficial for physics students, educators, and anyone interested in optical phenomena, particularly those studying light behavior in transparent materials.

Electro
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Hello to all,
I have a physics problem regarding reflection of light.

A solid glass cube, of edge 10 mm and n = 1.5 has a small spot at its center. a) What parts of each cube face must be covered to prevent the spot from being seen, no matter what the direction of viewing? b) What fraction of the cube surface must be covered?

The point is that I don't get what the problem is implying. Anyone can give a hint or just a startup clue?
Thank You
 
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When viewed from certain angles, the spot would not be visible due to bending (refraction) of light; however, the spot would be visible at certain other points. It's asking what must be 'blacked out,' so to speak, in order for the spot never to be seen from the areas where refraction wouldn't prevent it from being seen, and then, what fraction (how much) of the surface area must be covered.
 

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