CH25 UTQ Please show your work and explain if you would like. I WILL RATE YOU!!!

Question

CH25 UTQ

Please show your work and explain if you would like. I WILL RATE YOU!!!

Thank you :)

A writer uses a converging lens of focal length f = 12 cm as a magnifying glass to read fine print on his book contract. Initially, the writer holds the lens above the fine print so that its image is at infinity. To get a better look, he then moves the lens so that the image is at his 25-cm near point. In what direction (toward or away from the fine print) did the writer move the lens? away from the fine print toward the fine print How far did the writer move the lens? Assume his eye is adjusted to remain always very near the magnifying glass. Express your answer using two significant figures and include the appropriate units. delta d =

Explanation / Answer

final position: 1/o = 1/f - 1/i = 1/12 + 1/25 = 0.1233 ==> o = 8.11 cm

The lens is moved a distance of: d = 12 - 8.11 = 3.89 cm

8 is less than 12, so the lens should be moved toward thefine print.

part A

toward the fine print

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