First, we'll use it as a map to understand the image patterns of the lens。
When the distance of the object is more than two times the focal length, the light that draws the candle over the light heart remains in the same direction, the light that parallels the main axis is over-focused, and the point where the light intersects is the image of the candle. This is the idea of a reverse and shrinking image between one and two focal lengths。
When the distance equals two times the focal length, the light that paints the candle over the light heart remains in the same direction, and the light parallel to the main axis is over-focused, when the light over the light heart, as well as the distance of the object and the distance of the image form the full equivalent triangle。
The candle candles are so large as to be upside-down at twice the focal range that, when the distance is between one and two, the light that draws the candles over the heart of light remains in the same direction and the light that parallels the main axis of light is so focused. The projector is the method of imaging at a time when candles have been found to be inverted and amplified at twice the focal range。
When the distance of the object is 1 fold, the direction of the light that draws the candle over the light heart remains unchanged, and the light that parallels the main axis is over-focused, at which time the parallel light source is available without imaging。
When the light that paints the candle over the bright heart remains in the same direction and the light that parallels the main axis is over-focused, when the illumination of the candle on the side is visible and magnified, the magnifying glass is the principle of imaging at this time。
Summarize the false findings about the elephant。
• within a single choreography, the lens is a figurative image, which is a reality, with a short choreography of 1 choreography。
• for the size of the elephant, the reduced image is formed outside the two-fold focal length, the magnified image is formed within the two-fold focal length, and the sum is stated at the two-fold focal length fraction。
• with regard to the distance and the distance, the light, like the distance and the distance, over the light heart, constitutes two similar triangles。
• when the distance is greater than the distance, it is larger than the object. As when the distance is less than the distance, as if it were less than the object。
• with regard to the positive fall of the image, the images of the lens are set in the face of a candle, and the illusions are standing on the side. About like change. When the image is made, when the object is close to the cascading mirror, away from the cascading mirror and larger, it is written that the object is much larger and much smaller。
Let's take a look at the case。
Somewhere in tiananmen square, you want to shoot the whole view of tiananmen city? However, that position was only possible from the frame of the view。
How do you want to do it to get to tiananmen? An analysis shows that only part of the city building was seen in the frame of view, indicating that the image was large, that the lens was too close to the city building, that, depending on the size of the object, it should be kept away from the tiananmen gate building, while reducing the length of the dark box and bringing the film close to the camera. That's what this section says. Have you learned? See you next class。
