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Chapter 35: Q 4. (page 1016)
A red card is illuminated by red light. What color will the card appear? What if it鈥檚 illuminated by blue light?
Red in first case and black in second case.
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A -diameter microscope objective has a focal length of . What object distance gives a lateral magnification of ?
A magnifier has a magnification of . How far from the lens should an object be held so that its image is seen at the near-point distance of ? Assume that your is immediately behind the lens.
Two converging lenses with focal lengths of 40 cm and 20 cm are 10 cm apart. A 2.0-cm-tall object is 15 cm in front of the 40-cm-focal-length lens. a). Use ray tracing to find the position and height of the image. Do this accurately using a ruler or paper with a grid, then make measurements on your diagram.
b). Calculate the image position and height. Compare with your ray-tracing answers in part a.
To focus parallel light rays to the smallest possible spot, should you use a lens with a small f-number or a large f-number? Explain.
A -focal-length converging lens is to the right of a -focal-length converging lens. A -tall object is distance L to the left of the first lens.
a. For what value of L is the final image of this two-lens system halfway between the two lenses?
b. What are the height and orientation of the final image?
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