a) Use the lens equation
1/do + 1/di = 1/f , with di = 2.12 do
1/do + 1/(2.12 do) = 1/53.6
1.4717/do = 1/53.6
do = 78.9 mm
b)Use the same equation, with
di = -2.12 do
1/do -1/(2.12 do) = 1/53.6
0.5283/do = 1/53.6
do = ____ ?
(a) How far from a 53.6 mm focal-length lens must an object be placed if its image is to be magnified 2.12X and be real?
(b) What if the image is to be virtual and magnified 2.12X?
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