Lab 11 Focal Length of a Convex Lens

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St. Petersburg College *

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Physics

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Dec 6, 2023

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1/11 Lab 11: Focal Length of a Convex Lens Objectives The objectives of this lab are to measure the focal length of a converging lens using two different methods. Calculate the focal length and magnification of two converging lenses using the thin- lens and magnification equations. Background Review ‘ Image Formation by Lenses ’ section in Chapter 25 in your textbook and PPT slides. Materials Student Supplied HoL Supplied Digital camera or smartphone 1.5 m measuring tape Two 3” x 5” index cards Pair of safety goggles Lighter or match Ruler Clear roll of tape Lens set: Convex Lens A Convex Lens B
2/11 Two plastic lens holders Plastic screen holder Tea candle 2 Sheets of white paper Table near a window with unobstructed view Textbook or similar object approximately 3 cm thick Procedure You will complete a lab report that includes data tables, photos, graphs (if any) following the instructions given in “How to write a formal lab report”. The lab report should be a single Word document. You will submit the report by using SUBMIT link given in weekly lab modules in MyHCC (Canvas) lab course. Exercise: Determining the Focal Lengths of Convex Lenses In this exercise, you will determine the focal length of two convex lenses using a distant object. You will then determine the focal length of the lenses using a candle. Part 1: Determining the Focal Length with a Distant Object
3/11 Note: This procedure requires a dimly-lit room with an outside-facing window producing an unobstructed view of a distant object. Best results are obtained on a sunny day. 1. Put on your safety goggles. 2. Gather both lenses and lens holders, the screen holder, the measuring tape, and one 3”x 5” card. 3. Place the 3”x 5” card vertically into the screen holder. 4. Place the thick convex lens (now referred to as Lens A) into one lens holder. 5. Locate a large, distant object outside the window approximately 10 or more meters away, such as a tree, telephone pole, or automobile. 6. Place your lens and screen on a table next to a window, keeping them in line with the distant object and placing the lens between the window and screen. See Figure 1.
4/11 Figure 1. Experimental setup for viewing a distant object outside a window (left) and closeup of image produced on the screen (right). 7. Adjust the position of the lens by moving it back and forth between the window and screen until an image of the distant object focuses on the screen. 8. Measure the distance from the center of the lens to the screen with the measuring tape to the 0.1 cm. Record as the measured focal length in Data Table 1 . Refer to Figure 2.
5/11 Figure 2. Measuring the distance between the lens and screen. 9. Repeat steps 4-8 for the thin convex lens (Lens B). Part 2: Determining the Focal Length with a Candle 10. Gather the lenses in their lens holders, the screen holder with the index card, the candle, a lighter, a book with a height of approximately 3 cm, the measuring tape, and clear tape before you enter a dimly-lit room with a table. Note: Close the blinds of the window if using the same table as in Part 1. 11. Use the clear tape to secure the measuring tape to the table, parallel to a side, with the centimeter scale facing upward. Reference Figure 3 for measuring using the measuring tape.
6/11 Figure 3. Reading the measuring tape. Each centimeter increment is indicated by a long line spanning the width of the measuring tape and is labeled above that line. 12. Place the candle on the book, with the candle wick centered at the 0 cm mark. Record the position in Data Table 2 . 13. Place the screen at the 30.0 cm mark of the measuring tape and record the position to the 0.1 cm in Data Table 2 . See Figure 4.
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