Thanks One light source; Thin lenses set; Index card; Ruler; Viewing screen; Len

Question

Thanks One light source; Thin lenses set; Index card; Ruler; Viewing screen; Lens holder Lens carriage; 2 meter track Caution e Turn the light source off when not in use. The outer shell of the light source can be .Handle the optical elements by the handles provided or by the edges! Otherwise very hot after it's been turned on for a while. you'll leave fingerprints on the edges that will interfere with their performance. Part 1: Image Formed by a Convex (Converging) Lens To determine the focal length of the lens, form an image on a screen or piece of paper of a light source that is at least 6 meters away (when s>f, the object may be considered at infinity). Measure the distance from the paper to the lens. This is the measured focal length of the lens. 1) Why does this method allow you to directly measure the focal length of the tom Describe the image characteristies. Is it upright or inverted, reduced or enlarged and is it real or virtual? Th image 6 nerkd The image is real 2) The imqe redad 3) Cover the lower part of the lens with an index card, do you still see the whole image of the light source? Explain why or why not.

Explanation / Answer

Every part of the lens has the same focal length as complete lens. Hence each part of the lens has the ability to form the complete image. However, when we cover the lower part (or any part) of the lens the number of light rays that form the image will be reduced. Hence the image will be less bright than when the complete lens is used.

Yes, we can the see the complete image of the light source.

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