❒ Grad ❒ Undergrad ❒ Faculty ❒ Other❒ I have done this pretest/tutorial before(continued on other side)Tutorials in Introductory Physics ©McDermott, Shaffer, & P.E.G., U.Wash.EM-UCO1120044T-PD(CXL)W1a Autumn 2004PRETEST: CONVEX LENSES1. The diagrams at right illustratewhat an observer sees whenlooking at a pencil through alens. The observer’s view isshown from two slightlydifferent perspectives: one fromthe center, and one from theright.Is the image of the pencillocated closer to, farther from,or the same distance from theobserver than the pencil itself?If it is not possible to determinewhether the pencil or its image iscloser to the observer, state that explicitly.Explain your reasoning.2. An object is placed near a converging lens as shown below. Each focal point of the lens ismarked by an F. Two rays have been drawn to determine the location of the image of theobject.FObjectImageThin converging lensF?Continue the third ray shown on the diagram to show the path through the lens and on theother side of the lens. Explain your reasoning.LensPencilObserverLensPencilObserverLensPencilLensPencilObserver’s viewfrom centerTop view Observer’s viewfrom rightTop viewTutorials in Introductory Physics ©McDermott, Shaffer, & P.E.G., U.Wash.EM-UCO1120044T-PD(CXL)W1a Autumn 20043. A converging lens, a long-filament bulb, and a screen are arranged as shown in theperspective view diagram below. A sharp, inverted image of the filament of the bulb (notshown) appears on the screen when it is at the location shown.LensScreenBulba. Describe how, if at all, the image on the screen would change if an opaque mask wereplaced between the lens and the bulb so it covers the top half of the lens. (See figurebelow.) Explain your reasoning.LensScreenBulbb. Suppose that instead the mask were placed between the lens and the screen but the maskstill covers the top half of the lens. Would the image on the screen change from what itwas in part a? If so, how would it change? If not, why would it not
View Full Document
Unlocking...