O BJECTIVES To demonstrate the formation of images from convex and concave lense

Question

O BJECTIVES To demonstrate the formation of images from convex and concave lenses To identify the type of image formed by convex and concave lenses. . To confirm the lens equations. PART 1 CONVEX LENS 1. 2. 3. Open GOOGLE CHROME or other compatible browser and DISABLE all BROWSER POP-UP BLOCKERS Go to PhET Simulations to Play with Sims to Physics to Light and Radiation to Geometric Optics to Run Now! Take some time to play with the simulation to get familiar with how it works. 4. Maximize your screen. Warning For the measurements taken in this lab, the ruler in the PhET program will not work. Therefore, we will use a standard ruler measuring from the computer monitor. The scale used to make these measurements will change from computer to computer so once you start, you must finish. 5. In this lab, you will be moving the object to analyze how images are formed. When you are ready to get started be sure that your settings are as follows: No Rays Marginal ays Prindical ays Many rayt Change object to yellow arrow 0.8 1.53 0.8 Show Ovides Scuvaure rad) refactive indes diameterm) 6. Using the ruler, measure the distance from x to the center line of lens. Record in Data Table 1 as f. Double this value and record as 2f 7. Measure the height of object (ho) and record. 8. Place the yellow arrow beyond 2f 9. In Data Table 2, record do, di, hi and your observations of the image. 10. Move the yellow arrow to 2f. Record in Data Table 2 Your measurements for do, di, hi and your observations 11. Move the yellow arrow to between 2f and f. Record in Data Table 2. Your measurements for do, di, 12. Place the yellow arrow at f. Record your observations. (Having trouble locating image, check your 13. Move the yellow arrow to a position that is halfway between f and the lens. If you can't locate the of the image. hi and your observations of the image ray diagram sheet) Record your observations in Table 2 image, check the box next to Virtual Image. Record your observations in Table 2

Explanation / Answer

Table 1

Focal Length Calculation using, 1/v - 1/u = 1/f

Average Focal Length = ( 4.2 + + 4.2 + 4.2 + 4.19 ) /4 = 4.1975

% Error = ( 4.2 - 4.1975 ) * 100 /4.2 = 0.0595 %

Table 2 Position Of Object Beyond 2f (cm) At 2f (cm) Between 2f and f (cm) At f (cm) Between f and lens (cm) do -14 -8.4 -6.5 -4.2 -2.1 di 6 8.4 11.8 Infinity -4.4 hi 1 2.4 4.2 Very 5 cm Type of Image Real Real Real Real Virtual Direction of Image Inverted Inverted Inverted Inverted Upright

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