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| Experimental components |
An optical base with a scale, an F light source (or a candle, to be provided by yourself), a convex lens, and a white light screen. |
| Experimental process | (1) Install the light source, convex lens, and light screen in the order shown in the figure above. (2) Adjust the light source to a distance so that the object distance is greater than twice the focal length (μ>2f), adjust the distance between the light screen and the convex lens so that the flame forms a clear image on the light screen, observe the size of the image and their relationship between positive and negative, determine whether the image is virtual or real, observe the range where the image is formed, and record this value. (3) Place the light source at twice the focal length (μ=2f), adjust the distance between the light screen and the convex lens so that the light source can form a clear image on the screen, observe whether the image formed is positive or inverted, and determine whether it is virtual or real. Observe where the image is located and record it. (4) Move the light source towards the convex lens so that the object distance is between one focal length and two focal lengths (f<μ<2f), repeat the above operations, measure and observe, and record. (5) Move the light source to coincide with the focus of the convex lens (μ=f), move the light screen to see if an image can be formed. Observe from the other side of the convex lens to see if you can see an image and record it. (6) Continue to move the light source towards the convex lens so that the object distance is less than the focal length (μ<f), move the light screen to see if an image of the light source can be formed on it. Then remove the light screen and observe through a convex lens from one side of it to determine whether it has been enlarged or reduced, whether it is upright or inverted, and record it. |
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