SOLUTION: Your textbook says that the focal length f of a lens is given by the lensmaker's formula 1/f=.06 (1/r1+1/r2) where r1 and r2 are the radii of the two circular surfaces. If those ra

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Your textbook says that the focal length f of a lens is given by the lensmaker's formula 1/f=.06 (1/r1+1/r2) where r1 and r2 are the radii of the two circular surfaces. If those ra      Log On


   

Question 1036106: Your textbook says that the focal length f of a lens is given by the lensmaker's formula 1/f=.06 (1/r1+1/r2) where r1 and r2 are the radii of the two circular surfaces. If those radii are 4 and 6 respectively, find f.
A. 1/4
B. 16.67
C. 3/25
D. 4
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'm assuming the .06 is supposed to be 0.6


1%2Ff+=0.6%2A%281%2F%28r%5B1%5D%29%2B1%2F%28r%5B2%5D%29%29


1%2Ff+=+0.6%2A%281%2F4%2B1%2F6%29


1%2Ff+=+0.6%2A%283%2F12%2B2%2F12%29


1%2Ff+=+0.6%2A%285%2F12%29


1%2Ff+=+%286%2F10%29%2A%285%2F12%29


1%2Ff+=+%286%2A5%29%2F%2810%2A12%29


1%2Ff+=+30%2F120


1%2Ff+=+1%2F4


f+=+4


The final answer is D) 4