25.10. Set Up: so (a) (b) (c) The 19.5 mm distance is the telephoto focal length, since it produces greater magnification of the image. 25.11. Set Up: Solve: (a) (b) The dimensions of the image are and 25.12. Set Up: The image is real since it is projected onto the screen; Solve: (a) (b) For and gives The image is at infinity and for the screen any finite distance from the lens the image won’t be in focus on the screen. The answer is no. 25.13. Set Up: The image is real since it is projected onto the screen; Solve: (a) (b) so the image has dimensions by Reflect: The object is just outside the focal point of the lens. and the image is greatly enlarged. 25.14. Set Up: The magnification should be The image is real so and Solve: (a) (b) (c) One dimension of the image is The other is 25.15. Set Up: The magnification has magnitude The image is real, so and Solve: (a) (b) Reflect: Only this particular focal length gives both an image distance of 6.0 m and the desired image size. s
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