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SNC2D Optics: Measuring Focal Length of a Lens Purpose: In this activity you will use the thin lens equation to measure the focal length of a convex or converging lens. Apparatus: Optical bench with lens, object, and screen illuminated . lens object screen (in support) . 10 20 30 40 50 0 70 80 90 100 110 120 130 140 150 160 170 180 150 200 e e Below is an example of how to calculate the object & image position from the measurements: Object position=0 cm Lens position = 80 cm image position =155 cm Object distance d, =80 cm -0 cm =80 cm Image position d;= 155 cm -80 cm =75 cm Procedure: Arrange the object at various position from the lens and adjust the screen to obtain a sharp image of the object. Measure the height of the object. Record the lens position, object position, screen (image) position and the image height. Record the characteristics of the image. Analysis: 1. Use the positions recorded to calculate the object distance and the image distance for each arrangement. 2. Use the thin lens equation to calculate the focal length of the lens for each arrangement. ( 1_ 1 L) f - dO di Calculate the average value of the focal length. d h Calculate the magnification for each arrangement using both equations. (M = d' = h' ) State the characteristic of the image for each arrangement. Write a concluding statement for the focal length of the lens. oun W Trial 1: Image larger than the object Object position =20 cm Lens position =50 cm Image position = 110 cm Object height =4 cm Image =8 Trial 2: Image smaller than the object Object position = 10cm Lens position =60 cm Image position = 93 cm Object height = 4 cm Image = 2.6 cm Trial 3: Image the same size as the object Object position =10cm Lens position =50 cm Image position = 90 cm Object height = 4 cm Image =4 cm Average Focal length Calculation: Concluding statement