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Precautions for the lens focal length measurement experiment

2021-06-28(684)Views

Precautions for the lens focal length measurement experiment.

Precautions for the lens focal length measurement experiment. When doing the experiment of "lens focal length measurement", in order to facilitate the experiment operation, the experimental phenomenon is obvious, and the correct conclusions and rules can be obtained, the following aspects should be paid attention to before and during the experiment:

1. Precautions before the experiment:
(1) The focal length (f) of the convex lens should be selected appropriately, not too small or too large, preferably about 10cm: if the focal length (f) is too large, it is very likely that the candle cannot find u>2f and f .
(2) The length of the candle cannot be too long or too short.

(3) The laboratory should conform to the darkroom as far as possible, and there should be no wind.

2. Matters needing attention in the test:
(1) When assembling convex lens, candle and light screen, pay attention to:
① Fix the convex lens, which is convenient for measuring the object distance and image distance. The candle and the light screen are not fixed, which is convenient for the candle and the light screen to move;
② Try to ensure that the "three hearts"-candle flame core, lens center, and light screen center are adjusted to the same level, otherwise it will cause the candle's image to be not in the center of the light screen or not on the light screen at all. Like
③ If the laboratory is not a dark room, you should place the candle on the side away from the light, and the side of the light screen that receives the image should face the light to ensure that the image on the light screen is clear and bright.

(2) When studying "candles are upright magnified virtual images within one focal length", there is no image on the light screen. The light screen should be placed at one end of the optical bench or the light screen should be removed, and the convex lens should be penetrated from the side of the light screen. Observe the state of the image from the side of the candle.
The application of the lens has benefited us. The above is all the contents of the experimental precautions for the focal length measurement of the lens shared today. The experiment is the best way to verify the theory, such as Runzhihui lens manufacturers. We are constantly testing and experimenting with the results of the data. To produce better products, you can consult us if you have any questions about the lens.

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