How to Calculate Radii for a Symmetric Converging Lens to Double Image Size?

[Mennethitus]

Homework Statement

An object is 34.0 cm from a screen.

What are the radii of a symmetric converging plastic lens (i.e., two equally curved surfaces) that will form an image on the screen twice the height of the object? (Take the index of
refraction of plastic to be 1.59.)

Homework Equations

(1/f) = (1/s) + (1/s')

(1/f) = (n-1)[(1/R)-(1/R')]

The Attempt at a Solution

I attempted to use those two equations to solve the problem, my answers were 71.5 and 25.2. Both were wrong.


If anyone can help within the next 1 hour and 30 minutes I would really appreciate it, thank you

 

[Mennethitus]

Never mind, I solved it.