What is the reason why the light screen cannot receive images?

The reasons are: 1. The convex lens, candle, and light screen are not at the same level, and the image falls outside the light screen; 2. The candle is within 1 times the focal length, upright, amplified, and virtual, resulting in light The screen cannot display an image; 3. The focal length of the convex lens is too large and the length of the optical bench is not enough to measure the data.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

There may be three reasons:

1. The convex lens, candle, and light screen are not at the same level, and the image falls outside the light screen;

2. Candle Within 1 times the focal length, the image is upright, magnified, and virtual, causing the light screen to be unable to display the image;

3. The focal length of the convex lens is too large, and the length of the optical bench is not enough to measure the data.

Extended information:

Convex lenses have a magnifying effect. Convex lenses are divided into large and small at twice the focal length, and are divided into real, virtual, upright and inverted at one focal length.

Inject parallel light rays (such as sunlight) parallel to the main optical axis (the line connecting the centers of the two spherical surfaces of the convex lens is called the main optical axis of the lens), and the light passes twice on both sides of the lens After refraction, it is concentrated on a point on the axis. This point is called the focus of the convex lens (marked as F, English: focal point). The convex lens has a real focus on both sides of the mirror. For example, when it is a thin lens, these two focuses reach the lens The centers are roughly the same distance apart. The focal length of a convex lens refers to the distance from the focus to the center of the lens, usually expressed as f. The smaller the spherical radius of the convex lens, the shorter the focal length (symbol: f, English: focal length). Convex lenses can be used in magnifying glasses, glasses worn by people with presbyopia and farsightedness, cameras, movie projectors, slide projectors, microscopes, telescope lenses, etc.

Main axis: The straight line passing through the two spherical centers C1.C2 of the convex lens is called the main optical axis of the convex lens. Optical center: The center point O of the convex lens is the optical center of the lens. Focus: The light rays parallel to the main axis converge at a point F on the main optical axis after passing through the convex lens. This point is the focus of the convex lens. Focal length: The distance from the focal point F to the optical center O of the convex lens is called the focal length, represented by f. Object distance: The distance from the object to the optical center of the convex lens is called the object distance, represented by u. Image distance: The distance from the image formed by an object through a convex lens to the optical center of the convex lens is called the image distance, represented by v.

In fact, neither convex lenses nor concave lenses have a certain focus. Only light rays parallel to the main optical axis and at the same distance from the main optical axis will completely intersect on the main optical axis. The reason why we see that many light rays passing through a convex lens that are parallel to the main optical axis but at unequal distances from the main optical axis have a "focus" is because the curvature radius of the convex lens mirror is large and the difference in the degree of light deflection is not obvious. For ease of use, we take the intersection point of two rays at an equal distance from the main optical axis and the top of the convex lens as the focus of the convex lens.

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