Grad Undergrad Faculty Other I have done this pretest tutorial before PRETEST CONVEX LENSES 1 The diagrams at right illustrate Top view what an observer sees when looking at a pencil through a lens The observer s view is shown from two slightly different perspectives one from the center and one from the right Pencil Observer s view from center Pencil Observer s view from right Pencil Lens Is the image of the pencil located closer to farther from or the same distance from the observer than the pencil itself Observer If it is not possible to determine whether the pencil or its image is closer to the observer state that explicitly Explain your reasoning Top view Pencil Lens Lens Lens Observer 2 An object is placed near a converging lens as shown below Each focal point of the lens is marked by an F Two rays have been drawn to determine the location of the image of the object Object F F Image Thin converging lens Continue the third ray shown on the diagram to show the path through the lens and on the other side of the lens Explain your reasoning continued on other side Tutorials in Introductory Physics EM UCO1120044T PD CXL W1a McDermott Shaffer P E G U Wash Autumn 2004 3 A converging lens a long filament bulb and a screen are arranged as shown in the perspective view diagram below A sharp inverted image of the filament of the bulb not shown appears on the screen when it is at the location shown Bulb Lens Screen a Describe how if at all the image on the screen would change if an opaque mask were placed between the lens and the bulb so it covers the top half of the lens See figure below Explain your reasoning Bulb Lens Screen b Suppose that instead the mask were placed between the lens and the screen but the mask still covers the top half of the lens Would the image on the screen change from what it was in part a If so how would it change If not why would it not change Bulb Lens Screen Tutorials in Introductory Physics EM UCO1120044T PD CXL W1a McDermott Shaffer P E G U Wash Autumn 2004
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