Posted by Anonymous on Tuesday, March 27, 2012 at 5:08pm.
Thin Lens Equation
1/d +1/f = 1/F,
where d is the object distance,
f is the image distance
F is the focal length
A is the size of the object
B is the size of the image.
B = 0.55•A,
From the similarity of triangles
d/A = f/B
d = (A/B) •f = f/0.55
F = d•f/(d+f) =f/1.55=0.3/1.55 = 0.194 m
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