In a projection lantern of focal length f, the object distance u, is such that
A
u > 2f > f
B
u < f < 2f
C
u = f < 2f
D
f < u < 2f
Verified Correct Answer: D.
Physical Principles & Numerical Solution
the object is always located between the optical center of the lens and twice the focal length. or the object is placed at a point between F and 2F to produce a real, enlarged, upright image of the inverted object.
Source: Myschool Past Questions Archive (Record #27928)