Ray

Light ray loses 1/19 of brightness passing through a glass plate. What is the brightness of the ray after passing through 5 identical plates?

Correct answer:

x =  0.7631

Step-by-step explanation:

r=1119=1 1919119=1919119=19119=18190.9474 n=5  x=rn=0.94745=0.7631r = 1 - \dfrac{ 1 }{ 19 } = \dfrac{ 1 \cdot \ 19 }{ 19 } - \dfrac{ 1 }{ 19 } = \dfrac{ 19 }{ 19 } - \dfrac{ 1 }{ 19 } = \dfrac{ 19 - 1 }{ 19 } = \dfrac{ 18 }{ 19 } \doteq 0.9474 \ \\ n = 5 \ \\ \ \\ x = r^{ n } = 0.9474^{ 5 } = 0.7631



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Our percentage calculator will help you quickly and easily solve a variety of common percentage-related problems.
Do you want to round the number?

 
We encourage you to watch this tutorial video on this math problem: video1

Related math problems and questions: