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44% Sat 2:34 AM Q E 03 Safari File Edit View History Bookmarks Develop Window Help O O O HW 9 CS www.weba gn.ne web/Studen gnmen ponses/last?dep 9175097 Q8 Reade Apple Disney ESPN Yahoo! Causes of Diabetes Plagiarism Checker Announcements Blackb destiny dic Search Result. HW 9 An object is Placed 61. 2/3 points T Previous Answers Ser 23. P.003 y Notes multiple images. Find the distances from the person to the first three images seen in the A person walks into a oom that has, on opposite walls two plane mirrors producing left-hand mirror, when the person is 7.00 ft from the mirror on the left wa and 10.0 ft from the mirror on the right wa first image second image third image You response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out a intermediate results to at least four-digit accuracy to minimize roundoff error. ft Need Help? Read t Chat About It 3. 0/2 points I Previous Answers SerCP9 23.P.006.soln My Notes A dentist uses a mirror to examine a tooth that is 1.25 cm in front of the mirror. The image of the tooth is formed 12.0 cm behind the mirror. (a) Determine the mirror's radius of curvature. 2.23 Your response differs from the correct answer by more than 10%. Double check your calculations. cm (b) Determine the magnification of the image. Need Help? Read it Chat About ItExplanation / Answer
1)
The first image is the first reflection from the left-hand mirror. The reflection is as far behind the mirror as the person is in front of the mirror. So the distance to reflection 1 = 14.00 ft.
The second reflection is the reflection in the right mirror and again reflected by the left mirror. The reflection in the right mirror is 14.00 ft behind that mirror, which is 27 ft from left mirror. It will therefore appear 27 ft behind the left mirror. The second reflection is then 34 ft from the person.
The third reflection is the reflection in the right-hand mirror of the first reflection in the left-hand mirror. That is 20 ft from the right-hand mirror, so it appears 20 ft behind the right-hand mirror. It is 41 ft from the left mirror and so appears 41 ft behind the left mirror, and 48 ft from the person.
2)
r = radius of curvature
m = magnification.
Real is Positive sign convention.
Signs may be different with your convention.
(a)
1 / 1.25 - 1 / 12.0 = 2 / r
r = 2.79 cm.
(b)
m = - 12.0 / 1.25 = - 9.6
(virtual image).
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