Question

Open the KET-VPL LensesMirrors experiment. 2. Drag a converging lens to the optical bench. 3. Click and drag the ruler to measure the focal length of the lens. 15 cm 4. Locate an object inside F and use the ruler to measure the object and image distances. 25.3 cm 5. Relocate the object between F and 2 F and use the ruler to measure the object and image distances. 30 cm 6. Relocate the object outside 2 F and use the ruler to measure the object and image distances. 30 cm Analysis: 1. Use the data obtained in steps 4−6 to compute three experimental values of the lens's focal length. 2. Compare the experimental focal lengths to the measured focal length found in step 3.

Answer 1

1. To compute three experimental values of the lens's focal length, the following formula can be used:

f = (1/u) + (1/v)

where f is the focal length, u is the object distance, and v is the image distance.

2. To compare the experimental focal lengths to the measured focal length found in step 3, the calculated values can be compared with the measured value of 15 cm.

Note: The focal length of a lens can be calculated using the lens formula, which relates the object distance (u), the image distance (v), and the focal length (f) of a lens.