A person's eye lens is 2.8 cm away from the retina. What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
A) -2.8 cm
B) 2.8 cm
C) -2.4 cm
D) 2.4 cm
E) 2.2 cm
B
Physics & Space Science
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