The second section explores: the pattern of convulsion imaging; convulsion lenses (known focal length); light beams (with scale); candles (or other light sources); screens; and matches. (1) explore the pattern of lens imaging. (2) understanding the difference between reality and fiction. 2. Experimental learning. Repositioning the light screen so that the light from the candle can be reflected through the lens, so that the image of the candle can be clearly visible on the screen; when the light screen is not visible, the image of the candle can be seen through the lens. The pattern of lens imaging is derived from observational analysis. 3. Experimental design distance: distance of the object to the light heart, expressed in u. Like distance: like distance to light heart, expressed in v. Focal length: focus distance to light heart, expressed in f. 2-focal distance: twice the focal distance (starting with light), 2f indicates distance (u) like distance (v) 4. (down: upside down, upside down) apply the camera narrows and reverses the image 3000 16. 50 10 f 2f 2f (iv) experimental focal range application camera shrinks and reverses the size of 3000 16. 50 large upsides 20. 00 2005 f 2f 2f u = 2f, v = 2f, rises and rises. (reverse: upside down and upside down) 3 (point 3) is the image theory of the camera, as shown in the figure, and the camera's lens is (filling "crumb lenses" or "doma lenses"). A careful look at the size of the tree in the picture and the image on the film was found in the form of (fill 放大 缩小 缩小 缩小 缩小 缩小 . The camera cam lens narrows the reverse 4 minutes, as illustrated by the figure, on the one end of the cardboard a is covered with a translucent paper, on the one end of the cardboard b is embedded with a cam lens, and two cylinders together form a model camera. This model camera is a camera equivalent to a camera, a negative equivalent to a camera. In order to get a clear picture, the a-end should be directed to , the b-end to . (the latter two spaces are filled with “darker indoor” or “lightened outdoors”) cascading mirrors, semi-transparent paper, darker indoors, brighter outdoors 4. (5) when the object is located within one-fold focal length of the lens, it is amplified, and it is visible. 5. Photometric analysis of lens imaging patterns two of the three special circuits of cam lenses can be used to draw the light map to determine the size and image of the image, which is the best way to understand the pattern of cam lens imaging 15 (1) at that time, the pattern of cam lens imaging 15 (1) at that time, the evidence of reverse formation and shrinking. 3. Magnifying mirror (1) principle: (2) use: 2 reconciliation: 1 object in 1f figure 3 magnifying mirror image diagram u
