# Ray

Light ray loses 1/19 of brightness passing through glass plate. What is the brightness of the ray after passing through 7 identical plates?

Correct result:

x =  0.617

#### Solution:

$x=1\cdot \left(1-\frac{1}{15}{\right)}^{7}=0.617=61.7\mathrm{%}$ We would be pleased if you find an error in the word problem, spelling mistakes, or inaccuracies and send it to us. Thank you! Tips to related online calculators
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