Many people ask me what are the characteristics of the imaging of the projector? I think there are several main aspects.
Projector imaging features:
The projector is made of the principle of using a convex lens to turn upside down and enlarge the real image. When a convex lens magnifies a real image, the closer the object is to the convex lens, the larger the image will be. The farther away from the convex lens, the smaller the image is. So, to make the image bigger, move the slide closer to the lens.
However, the distance between the formed image and the lens also changes. If the distance between the lens and the screen is not changed accordingly, the image on the screen will be blurred.
So we should follow the law of convex lens imaging: when the object distance decreases, the image becomes larger, and the image distance becomes larger. The distance between the lens and the screen should be appropriately increased, that is, the slide projector should be moved away from the screen.
Projector imaging features:
- The object distance is greater than one focal length and less than twice the focal length;
- The image is an inverted and enlarged real image;
- Image imaging is reversed from left to right.
The projector is made of the principle of using a convex lens to turn upside down and enlarge the real image. When a convex lens magnifies a real image, the closer the object is to the convex lens, the larger the image will be. The farther away from the convex lens, the smaller the image is. So, to make the image bigger, move the slide closer to the lens.
However, the distance between the formed image and the lens also changes. If the distance between the lens and the screen is not changed accordingly, the image on the screen will be blurred.
So we should follow the law of convex lens imaging: when the object distance decreases, the image becomes larger, and the image distance becomes larger. The distance between the lens and the screen should be appropriately increased, that is, the slide projector should be moved away from the screen.
