Figure P34.72 shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 2.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram for the following: (a) Using only the ray shown, decide what type of lens (converging or diverging) this is. (b) What is the focal length of the lens? (c) Locate the image by drawing the other two principal rays. (d) Calculate where the image should be, and compare this result with the graphical solution in part (c). Figure P34.72
Figure P34.72 shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 2.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram for the following: (a) Using only the ray shown, decide what type of lens (converging or diverging) this is. (b) What is the focal length of the lens? (c) Locate the image by drawing the other two principal rays. (d) Calculate where the image should be, and compare this result with the graphical solution in part (c). Figure P34.72
Figure P34.72 shows a small plant near a thin lens. The ray shown is one of the principal rays for the lens. Each square is 2.0 cm along the horizontal direction, but the vertical direction is not to the same scale. Use information from the diagram for the following: (a) Using only the ray shown, decide what type of lens (converging or diverging) this is. (b) What is the focal length of the lens? (c) Locate the image by drawing the other two principal rays. (d) Calculate where the image should be, and compare this result with the graphical solution in part (c).
A fruit fly of height H sits in front of lens 1 on the central axis through the lens. The lens forms an image of the fly at a distance d= 20 cm from the fly; the image has the fly’s orientation and height HI = 2.0H.What are (a) the focal length f1 of the lens and (b) the object distance p1 of the fly? The fly then leaves lens 1 and sits in front of lens 2, which also forms an image at d = 20 cm that has the same orientation as the fly, but now HI =0.50H.What are (c) f2 and (d) p2?
You are designing lenses that consist of small double convex pieces of plastic having surfaces with radii of curvature of magnitudes 3.60 cm on one side and 5.25 cm on the other side. You want the lenses to have a focal length of 1.65 cm in air.
1)
What should be the index of refraction of the plastic to achieve the desired focal length? (Express your answer to three significant figures.)
An object is placed 10 cm in front of a diverging lens of focal length 20 cm. Which of the following diagrams correctly represents the ray diagram showing how the image is formed?
Group of answer choices
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A diagram of a horizontal line passing through a vertical lens. Along the horizontal line, from left to right, there is a dot, then there is a letter O with an arrow pointing upward above it, then the lens, then a second dot, and then a letter I with an arrow pointing downward under it. The arrow above the letter O ends, and a horizontal arrow extends from its end to the right until it meets the vertical lens. A diagonal arrow begins at the intersection of the vertical and horizontal arrows, and extends to the right and down. A second diagonal arrow begins at the intersection of the horizontal arrow and the lens, extending to the right and down, through the second dot on the horizontal line. Both diagonal arrows end at the end of the arrow below the letter I.
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A diagram of a…
Chapter 34 Solutions
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