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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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  Subject Author Date
Solutionmy solutionCharlie2016-07-06 14:52:48
Questionnot too illuminatingDej Mar2016-07-06 14:25:31
Some ThoughtsQuick ThoughtBrian Smith2016-07-06 12:17:06
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