Is the projector use convex lens or concave lens? A convex lens is used, and the projector lens is a convex lens, because the projector needs the light to pass through the lens to form an inverted image and must be a real image, so a convex lens is used, because the convex lens will form an enlarged, inverted real image.
Is the projector a convex lens or a concave lens?
The projector is a convex lens. The reason why the projector uses a convex lens is related to the imaging method of the projector. Because the image projected by the projector is an inverted enlarged real image, a concave lens cannot be used. Therefore, the use of a concave lens will make the projected image in the projection light path smaller. , does not meet the imaging requirements, only the light passing through the convex lens can project an enlarged picture.
The imaging law of convex lens means that the object is placed outside the focus, and an inverted real image is formed on the other side of the convex lens. The real image has three types: reduction, equal size, and enlargement. When the object distance is within one focal length, an upright and enlarged virtual image is formed; when it is between one focal length and two times the focal length, an inverted and enlarged real image is formed; when it is beyond the double focal length, an inverted and reduced image is fromed. real image; when the focal length is equal to the object distance, no image is formed.
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