Whether the object is enlarged or reduced, and what you look at through a magnifying glass is like e

<> memorization formula: (1) One time the focus is divided into virtual and real, two times the focus is divided into size, and twice the focus is on the image. The real image is always reversed. The near image of the object becomes larger, and the distant image of the object becomes smaller.

The virtual image is always on the same side. The far image of the object becomes larger, and the near image of the object becomes smaller. The size of the image is fixed, the image follows the object, and the object distance and the image distance are changing.

2) One double focal length is divided into virtual and real, and two times the focal length is divided into size. The near image of the object becomes larger, and the distant image of the object becomes smaller. Note:

The double focal length referred to here refers to the distance from the point where the parallel light source converges to the main optical axis through the lens to the center of the lens, which can also be directly called the focal length; The two-fold focal length refers to the two demarcation points of the two-fold convex lens imaging at this distance: the 2f point is the demarcation point for magnifying and reducing the real image; Point F is the dividing point between the real image and the virtual image. Thin lens imaging satisfies the lens imaging formula:

1 U (object distance) + 1 V (image distance) = 1 F (lens focal length) Note: The lens imaging formula is for thin lenses, and the so-called thin lens refers to the lens whose thickness is negligible when calculating the object distance and image distance. When the lens is thick, the effect of lens thickness on imaging must be considered.

The characteristics of convex lens imaging are summarized as follows:

1. When the object distance is less than the focal length, it becomes an upright and magnified virtual image.

2. When the object distance is equal to the focal length, it will not be imaged.

3. When the object distance is greater than the focal length but less than 2 times the focal length, it becomes an inverted and magnified real image.

4. When the object distance is equal to 2 times the focal length, it becomes an inverted and equal-sized real image.

5. When the object distance is greater than 2 times the focal length, it becomes an inverted and reduced real image.

The questions you asked correspond to points 1 and 3 above, respectively.

Looking through a magnifying glass Objects are not always magnified.

When the distance between the object and the magnifying glass is less than the focal length of the magnifying glass, the image is on the same side as the object, magnified and upright;

When the distance between the object and the magnifying glass is equal to the focal length of the magnifying glass, no imaging is taken;

When the distance between the object and the magnifying glass is between the first and second focal lengths of the magnifying glass, an inverted magnified image is formed on the other side of the magnifying glass;

When the distance between the object and the magnifying glass is twice the focal length of the magnifying glass, an inverted image of the same size as the object is formed on the other side of the magnifying glass;

When the distance between the object and the magnifying glass is greater than twice the focal length of the magnifying glass, an inverted scaled-down image is formed on the other side of the magnifying glass.

Therefore, magnified images are only formed when the object distance is less than one time the focal length and between the first and second focal lengths.

Zooming in and out is a common spring key in life. They exist because people need to know and understand things better, as well as to better achieve their goals. Magnification can help us perceive things better, for example, a magnifying glass can help us see small details better; Zooming in allows us to see the person or thing in it more clearly, so that we can better experience the emotions expressed.

Zooming out is also important to help us focus better and save time and energy. For example, zooming out on the map can more clearly see the patterns and information on the entire map; Shrinking the font size allows us to read large amounts of text more quickly. In addition, narrowing down can also help us achieve our goals better, for example, narrowing down the goals of a plan can make it easier for us to achieve it because the goals are more specific and doable.

In conclusion, zooming in and out is a common method in our lives, they can help us perceive things better, better achieve our goals, and are an indispensable part of our lives.

Do you know how to zoom in and out in life?

Hit a thing? Balloon? What are the pros and cons of people?

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Zooming means that you can zoom out and zoom in easily.

In Euclidean geometry, uniform scaling is a linear transformation of an object to scale up or down; The scale factor is the same in all directions; It's also called a bit-like transformation. The result of uniform scaling is similar (in a geometric sense) to the original object.

More generally, there is a scaling with a separate scaling factor in the direction of each axis; A special case is directional scaling (in one direction). The shape can change, for example, a rectangle may become a rectangle of different shapes, or it may become a parallelogram (keeping the angles between the lines parallel to the axis, but not all angles).

1.Convex lens imaging principle.

The magnifying glass is a convex lens, and when it is closer, the object becomes an upright magnified virtual image; A little farther away, the object becomes an inverted and shrunken real image, which is also the principle of stupid vertical imaging of the photographic failure.

2.Fluid pressure as a function of flow velocity.

The higher the flow velocity, the lower the pressure. When blowing the upper surface of a coin, the pressure on the upper surface becomes smaller, and the pressure on the lower surface is stronger, and the pressure difference holds the coin up.