Simple device for demonstrating imaging rule of convex lens
By designing a simple device including panels, runners, T-shaped thin rods and straight plates, dynamically displaying the imaging rules of convex lenses, solving the problem that existing teaching tools are difficult to explain the imaging rules of convex lenses, and improving students' learning interest and understanding effects.
Patent Information
- Application Number
- CN202421394385.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-12
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-12
AI Technical Summary
Existing teaching tools are difficult to effectively explain the imaging rules of convex lenses, which leads to students' memory confusion during the learning process and complex operations, which cannot fully mobilize students' interest in learning.
A simple device is designed, including a panel, a rotor, a T-shaped thin rod and a straight plate. Through the cooperation of these components, the imaging rules of convex lenses can be dynamically displayed to help students understand and remember.
This device helps students intuitively understand the imaging rules of convex lenses through the gradient process of dynamic display of light, improves students' learning interest and understanding effect, and simplifies the operation process.
Smart Images
Figure CN222914320U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a teaching demonstration device, in particular to a simple device for demonstrating the imaging law of a convex lens. Background Art
[0002] The imaging law of a convex lens is an important content in junior high school physics. The imaging situation of a convex lens is relatively complex, and students are prone to memory confusion or difficulty in understanding its principle during the learning process. At present, the experimental demonstration device using a physical convex lens commonly used in teaching can only display the law but is difficult to explain the principle, which is relatively limited in helping students master this part of knowledge and is also relatively complex in operation. Moreover, the teaching method of directly drawing a light path diagram to explain the imaging law without using teaching aids cannot display the gradual change process of light rays and is not easy to arouse students' learning interest. Content of the Utility Model
[0003] To solve the above problems, the utility model provides a simple device for demonstrating the imaging law of a convex lens, which is used to help students understand and remember the imaging law of a convex lens and its principle in teaching.
[0004] The technical solution of the utility model is: a simple device for demonstrating the imaging law of a convex lens, including a panel, a rotating wheel, a T-shaped thin rod, and a straight plate.
[0005] The panel is rectangular, with a chute parallel to the long side of the panel and having a width equal to the long side of the T-shaped thin rod located in its upper half. The dumbbell-shaped rotating wheel passes through the chute and can slide left and right along the chute. There is another chute near the bottom of the part of the rotating wheel located on the front side of the panel. The long side of the T-shaped thin rod passes through this chute and can slide along the chute until it is blocked by the short side. The straight plate is a rectangular thin plate, with a circular hole near the bottom. The straight plate is perpendicularly fixed to the panel, and the intersection line is parallel to the short side of the panel, and the midpoint of the intersection line is located at the center of the panel. The long side of the T-shaped thin rod passes through the circular hole on the straight plate.
[0006] The following lines are drawn on the panel: a dotted line passing through the center of the panel and parallel to the long side of the panel, a solid line located on the right side of the straight plate, below the dotted line, having the same distance from the center line of the chute to the dotted line and parallel to the dotted line, a straight line passing through the intersection point of the center line of the chute and the straight plate and a point F on the right side of the straight plate on the dotted line, the part on the left side of the straight plate is a dotted line, and the part on the right side of the straight plate is a solid line.
[0007] The point on the dotted line on the left side of the straight plate that is symmetric to the F point on the right side with respect to the straight plate is also marked as F. The two points on the dotted lines on both sides of the straight plate that are twice the distance from the straight plate as the distance from F to the straight plate are both marked as 2F. Description of the Drawings
[0008] Figure 1 is the front view of the utility model.
[0009] Figure 2It is a side schematic view of the runner part of the present utility model.
[0010] Reference numerals in the figure: 1, panel; 2, straight plate; 3, dotted line; 4, the part of the runner on the front side of the panel; 5, chute; 6, solid line 1; 7, dashed line; 8, long side of the T-shaped thin rod; 9, solid line 2; 10, short side of the T-shaped thin rod; 11, chute on the runner Specific implementation mode
[0011] The following combines the attached drawings to illustrate the specific implementation mode of the present utility model.
[0012] During the implementation process, the straight plate 2 represents a convex lens, and the round hole near the bottom on it represents the optical center. The dotted line 3 represents the principal optical axis, and the two points marked as F and the two points marked as 2F on it respectively represent the points on the principal optical axis whose distances from the optical center are one focal length and two focal lengths. The center of the part 4 of the runner on the front side of the panel represents the upper end of the imaging object, and the projection of this center on the dotted line 3 represents the lower end of the imaging object. The center line of the chute 5 represents the light ray parallel to the principal optical axis emitted from the upper end of the imaging object, the solid line 1 6 represents the transmitted light ray passing through the focal point after passing through the convex lens, and the dashed line 7 represents the reverse extension line of the transmitted light ray. The long side 8 of the T-shaped thin rod represents the light ray passing through the optical center emitted from the upper end of the imaging object, and its propagation direction remains unchanged before and after passing through the convex lens.
[0013] The specific implementation process is as follows: Slide the runner from the left end to the right end of the chute 5. According to the meanings of each part of the device described above, this process represents a continuous process in which the object distance decreases from large to small. During this process, the long side 8 of the T-shaped thin rod rotates continuously and changes direction under the constraint of the round hole on the straight plate 2, indicating the change in the direction of the light ray passing through the optical center emitted from the upper end of the imaging object during the process of the object distance decreasing from large to small. And the transmitted light ray of the light ray parallel to the principal optical axis emitted from the upper end of the imaging object after passing through the convex lens always passes through the right focal point and the direction does not change. Therefore, the intersection point of the long side 8 of the T-shaped thin rod and the solid line 1 6 is the position of the real image formed by the upper end of the imaging object. Because the distance from the solid line 2 9 and the center of the part 4 of the runner on the front side of the panel to the dotted line is equal, and this center represents the upper end of the imaging object, so the relative position relationship in the up and down direction between the position of the real image formed by the upper end of the imaging object and the solid line 2 9 can be used to judge whether the formed image is reduced, enlarged or of the same size as the imaging object. Through the relative position relationship in the left and right directions between the position of the real image formed by the upper end of the imaging object and the F point and the 2F point, the range of the image distance and the relative size relationship between the image distance and the object distance can be judged.
[0014] When the projection of the center of the part 4 of the runner on the front side of the panel on the dotted line 3 is the F point, it means that the object distance is equal to the focal length, and the long side 8 of the T-shaped thin rod is parallel to the solid line 1 6, indicating that no image can be formed when the object distance is equal to the focal length.
[0015] When the projection of the center of the part 4 of the rotating wheel located on the front of the panel on the dash line 3 is between the point F and the straight plate 2, it indicates that the object distance is less than the focal length. At this time, the long side 8 of the T-shaped thin rod is pulled out towards the short side 10, and the pulled-out part intersects with the dotted line 7 above the chute 5 on the left side of the straight plate 2, indicating that the image formed when the object distance is less than the focal length is an upright and enlarged virtual image.
[0016] The above embodiments are only one embodiment of the present invention, rather than all embodiments, and are not intended to limit the present invention. Other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.
Claims
1. A simple device for demonstrating the imaging law of a convex lens, characterized by: The invention comprises a panel, a rotating wheel, a T-shaped thin rod and a straight plate. The panel is rectangular and has a slide groove whose width is equal to the long side of the T-shaped thin rod and is parallel to the long side of the panel. The dumbbell-shaped rotating wheel passes through the slide groove and can slide left and right along the slide groove. There is another slide groove near the bottom of the rotating wheel located on the front of the panel. The long side of the T-shaped thin rod passes through the slide groove and can slide along the slide groove until it is blocked by the short side. The straight plate is a rectangular thin plate with a round hole near the bottom. The straight plate is fixed on the panel perpendicular to the panel, and the intersection line is parallel to the short side of the panel. The midpoint of the intersection line is located at the center of the panel. The long side of the T-shaped thin rod Pass through the circular hole on the straight plate; the following straight lines are drawn on the panel: a dotted line passing through the center of the panel and parallel to the long side of the panel, a solid line located on the right side of the straight plate, below the dotted line, at an equal distance from the center line of the slide to the dotted line and parallel to the dotted line, a straight line passing through the intersection of the center line of the slide and the straight plate and a point F on the right side of the straight plate on the dotted line, the left side of the straight plate being a dotted line, and the right side of the straight plate being a solid line; the points on the dotted line that are symmetrical about the straight plate to the left and right sides of the straight plate are also marked as F, and the two points on the dotted lines on both sides of the straight plate whose distance from the straight plate to the straight plate is twice the distance from F to the straight plate are both marked as 2F.