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A student is reading a lecture written on a blackboard. Thelenses in her eyes have a refractive power of 62.20 diopters, and the lens-to-retina distance is1.617 cm.

(a) How far (in meters) is the blackboard from hereyes?

(b) If the writing on the blackboard is 4.20 cm high, what is the size of the image on herretina (including the proper algebraic sign)?

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Category:- Physics
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