Solve the problem.The focal length f of a lens with index of refraction n is 
= (n - 1)
where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.
What will be an ideal response?
f = 
You might also like to view...
Solve the problem.A boat travels 4 miles south and then 7 miles east. How far is the boat from its starting point? Round approximations to the nearest tenth. 
East --7 mi-->
A. 32.5 mi B. 5.5 mi C. 4.05 mi D. 8.1 mi
The number of persons aged 18-64 receiving disability benefits through Social Security, the Supplemental Security income, or both, from 1990 through 2000 is approximated by the function 
, where 
is measured in units of a million and t is measured in years, with
class="wirisformula" data-wiris-created="true" src="https://sciemce.com/media/3/ppg__cognero__3.5_Higher_Order_Derivatives__media__ca7f4e72-8b82-41b1-8c30-83f4aea4cd9f.PNG" style="vertical-align:middle;" /> corresponding to the beginning of 1990.
?
Compute 
. Round your answer to five decimal places.
?
A. 
million
million per year
million per year in the second power
?
B.
million
million per year
million per year in the second power
?
C.
million
million per year
million per year in the second power
?
D.
million
million per year
million per year in the second power
?
E.
million
million per year
million per year in the second power
?
Write a formula for the general term, or nth term, for the given sequence.4, 10, 16, 22, 28, . . .
A. an = 4(6)n - 1 B. an = 6n - 1 C. an = 2n - 6 D. an = 6n - 2
Find any excluded values. 
A. ± 
B. ± 
C. 
D. ± 
, 3