Anna holds a 13 D magnifier directly in front of her eye to get a close...
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Anna holds a 13 D magnifier directly in front of her eye to get a close look at a 19-mm -diameter penny. Assume a typical 25 cm near point and a distance of 1.7 cm between the lens and the retina. |
Part A What is the closest possible distance that she can hold the coin to have it appear in focus? Express your answer with the appropriate units. |
Please answer and show full work/explain why! Thanks :)
Homework Answers
P = Power = 13 D
f = focal length = 100/P = 100/13 = 7.69 cm
di = image distance = - 25 - 1.7 = - 26.7 cm
do = object distance = ?
Using the equation
1/f = 1/di + 1/do
1/7.69 = 1/(- 26.7) + 1/do
do = 5.97 cm
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