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A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 69.40 diopters, and the lens-to-retina distance is 1.449 cm.
(a) How far (in meters) is the blackboard from her eyes?
m
(b) If the writing on the blackboard is 4.20 cm high, what is the size of the image on her retina (including the proper algebraic sign)?
cm
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