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Not too high, not too low (Posted on 2016-07-06) Difficulty: 3 of 5
A light source is placed on a table at a distance d
from the center of a coin.
The illumination of the coin is poor due to the low angle of illumination.
Lifting the light above table's level will improve the angle, but increase the distance.

What is the height needed to get the best illumination of the coin?

N.B. The puzzle was not placed in the "Calculus" category.

No Solution Yet Submitted by Ady TZIDON    
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Some Thoughts Quick Thought | Comment 1 of 3
Since Ady specifically pointed out this is not in Calculus, I suspect the answer is to make the height equal to the distance.
  Posted by Brian Smith on 2016-07-06 12:17:06
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