All answers have been checked against the answer key, and should be presumed to be correct. You should ask for help in the recitations if you are unable to obtain these results.
64. Real, 21.3 cm behind the lens. Total magnification = -70.8% (inverted image).
66. -10 cm. (The focal points of the two lenses must coincide, since the rays entering and leaving are parallel.)
31. If the converging lens has a longer focal length than the diverging lens, then the total focal length of the combination is negative, so the combination will be a diverging lens and will not form an image. The converging lens must have a shorter focal length than the diverging lens for the combination to form an image.
| Physics 222 | Department of Physics | University of Tennessee |