Copper Mirror
Copper Mirror
Can anyone help me out with terms and sequences PLEASE?
Archaeologists have suggested that the artists who painted the walls of tombs in the pyramids may have used a series of mirrors to reflect the outside sunlight into the tombs. If polished copper found on the site reflect light with a 30% loss of intensity find:
A) the percentage of sunlight delivered when a series of five copper mirrors is used.
B) the maximum number of mirrors that can be used if at least 5% of outside light is needed for detailed painting.
Would be totally greatful if any one can help me. If possible please show workings out. Appreciated. Thanks in advance
If 30% is lost, then each retains 70% intensity.
(.7)^5 = .168 = 16.8% for 5 mirrors.
(.7)^6 = .118 > 5%
(.7)^7 = .082 > 5%
(.7)^8 = .057 > 5%
(.7)^9 = .040 < 5%
So the maximum number of mirrors would be 8.
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