- #1
iurod
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Homework Statement
(a)How far from a 50.0-mm-focal-length lens must an object beplaced if its image is to be magnified 2.00 x and be real? (b)What if the image is to be virtual and magnified 2.00x?
Homework Equations
m = -di/do
1/do+ 1/di = 1/f
The Attempt at a Solution
m = -di/do solve for do
do = -di/2
Now i have to use the lens equation:
1/do+ 1/di = 1/f
-(2/di) + 1/di = 1/f
-1m/di = 1/f
di= -1m/(1/f)
di = (-1 x 2)/(1/50mm)
di = -100
This is what i got for part a, and I know it is totally wrong because to be a real image di>0 which is not what i got.
any help will be greatly appreciated. Thanks!