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Inquiry: Converging Lenses

Purpose: To determine the focal length and image forming characteristics of a converging lens

Procedure:

Case 1:

Use the 20 cm focal length converging lens, a meter stick and the window to validate the focal length of the lens and enter 1/f in your notebook.

Case 2:

Place the lens far enough from the 1.0 cm object screen so it will be at a distance of more than twice the focal length of the lens. Move the cardboard screen along the optical bench until the image that is formed upon it is as well defined as possible. Read and record the position of the object, lens, and image. Determine all of the variables in the table below and record in your notebook to the degree of precision permitted by the metric scale you are using.

Case 3:

For the second trial, place the lens at a position, which is distant from the object just twice the focal length of the lens. Then adjust the screen until the best-defined image is obtained. Determine all of the variables in the table below and record in your notebook to the degree of precision permitted by the metric scale you are using.

Case 4:

For the third trial, place the lens so that its distance from the object is more than once and less than twice the focal length of the lens. Adjust the screen to secure the best-defined image, and take all measurements as in the preceding cases.

Case 5:

Place the lens so that it is exactly one focal length away from the object. Try to form an image on the screen.

Case 6:

Place the lens so that it is less than one focal length away from the object. Try to form an image on the screen. Remove the screen, and placing your eye close to the lens, look through the lens at the object. What kind of image is produced by a converging lens using case 6?