Why is the image of the concave mirror reversed?

Imaging characteristics of concave mirror: concave mirror is reflection imaging, and the image can be inverted or magnified real image, or inverted or equal size real image, or inverted or reduced real image, or upright and magnified virtual image. It looks the same, but it's actually not the same:

The real image of the convex lens is on the opposite side of the object, and the virtual image is on the same side as the object; The real image of the concave mirror is on the same side as the object, and the virtual image is on the opposite side of the object.

The uses of concave mirrors are:

1. The concave mirror can be used to gather light, such as table lamps, radars, solar cookers and TV satellite antennas.

2. The light that uses the focus becomes a parallel light parallel to the main axis after reflection, such as flashlights, searchlights, medical headlamps, reflecting telescopes, etc.

3. The Olympic flame lighting ceremony is based on the principle of using a concave mirror to focus and form heat.

What is the difference between a concave mirror and a concave lens:

1. Different thicknesses: the concave lens is thick on the side and thin on the inside, and the convex lens is thick on the inside and thin on the edge.

2. Different uses: convex mirrors are mainly used for various curves and intersections. Concave mirrors use concave mirrors to converge light, solar cookers, desk lamps, TV satellite antennas, radars.

3. Different imaging: The convex lens is refractive imaging, and the image is like an inverted or magnified real image, or an inverted or equal-sized real image, or an inverted or reduced real image.

4. Different structures: The concave mirror is composed of a concave mirror on one side and opaque on the other. Convex mirrors are not.

Convex lens imaging principle model operation.

Both concave and convex mirrors are reflectors, the difference is that the former uses the inner surface of the ball as the reflective surface, and the latter uses the outer surface of the ball as the reflective surface; The effect of the former on parallel incident light is convergent, and the latter is divergent; The former becomes an inverted and shrunken reality, and the latter becomes a shrunken and upright illusion.

Both concave and convex lenses use the refraction of light. The difference is in structure, the former is thin in the middle and thick at the edges, while the latter is the opposite; The former diverges after refraction of parallel incident light, and the reverse extension line of the divergent light intersects the focal point (virtual focus), while the latter converges after refraction of parallel incident light and converges at the focal point (real focus). The former will always become an upright and shrinking virtual image, and the latter can become a real image (when the object distance is greater than the focal length) and can also become a virtual image (the object distance is less than the focal length, and the virtual image is upright and magnified).

Concave mirrors are reflected imaging. Face mirrors (including convex mirrors) are instruments that do not pass light through, but reflect it back to image, and light obeys the law of reflection. When the object distance is less than the focal length, it becomes an upright and magnified virtual image, and the farther the object is from the mirror, the larger the image.

When the object distance is greater than the focal length, it becomes an inverted and reduced real image, and the farther the object is from the mirror, the smaller the image. The real image is on the same side as the object, and the virtual image is on the opposite side of the object. The concave mirror not only allows the parallel rays to converge in the focal point, but also reflects the light from the focal point into a directional light.

The convex lens can be used as an inverted magnification, an equal-size, reduced real image, or an upright magnified virtual image. It can also converge parallel light, which can refract the light emitted by the focal point into parallel light. Because the concave mirror is reflected imaging, there will be no chromatic aberration, which is an incomparable advantage of any lens imaging.

The resolution of a telescope is directly proportional to the clear aperture of the objective lens, while a lens with a large aperture is extremely difficult to manufacture, and a concave mirror made using the principle of reflection is much easier to manufacture.

For thin concave lenses:

When the object is a physical object, it becomes an upright and shrunken virtual image, and the image and the object are on the same side of the lens;

When the object is a virtual object, and the distance between the concave lens and the virtual object is within one focal length (referring to the absolute value), it becomes an upright and magnified real image, and the image and the object are on the same side of the lens;

When the object is a virtual object, and the distance between the concave lens and the virtual object is one time of the focal length (referring to the absolute value), the image is at infinity;

When the object is a virtual object, and the distance between the concave lens and the virtual object is within two times the focal length other than one time (both refer to the absolute value), it becomes an inverted and magnified virtual image, and the image and the object are on the opposite side of the lens;

When the object is a virtual object, and the distance from the concave lens to the virtual object is twice the focal length (referring to the absolute value), it becomes a virtual image of the same size as the object, and the image and the object are on the opposite side of the lens;

When the object is a virtual object, and the distance between the concave lens and the virtual object is twice the focal length (referring to the absolute value), it becomes an inverted and reduced virtual image, and the image and the object are on the opposite side of the lens.

In the case of thick meniscus concave lenses, the situation is more complicated. When the thickness is large enough, it is equivalent to a Galilean telescope, and when it is thicker, it is equivalent to a positive lens.

Uses: Myopia glasses are concave lenses.

The concave lens has a divergent effect on the light, forming an upright and shrinking virtual image, the image is on the same side, the near image of the V object becomes larger, and the distant image of the object becomes smaller.

Question 1: What are the concave mirrors and convex mirrors?

When the object distance is greater than the focal length, it becomes an inverted real delay, the farther the object is from the mirror, the closer the image is to the mirror, and the smaller the image. When the object distance is less than the focal length, it becomes an upright and magnified virtual image, the closer the object is to the mirror, the closer the image is to the mirror, and the smaller the image.

The convex mirror is an upright, shrunken virtual image.

The reason is that concave mirrors converge light, and concave mirrors diverge light.

Problem 2: The image made by the concave mirror is smaller than the actual object.

Question 3: What is the difference between a concave mirror and a concave lens A concave mirror is a concave mirror, which is imaged by the reflection of light (light cannot pass through the mirror), and the concave mirror can be an inverted magnified real image, an inverted reduced real image, and an upright magnified virtual image. (Opposite to the mountain is a convex mirror, a rearview mirror of a car).

Concave lenses are imaged by the refraction of light (light can pass through the concave lens), and the concave lens can only be an upright and shrunken virtual image.

Question 4: What are the images of concave and convex mirrors?

When the object distance is greater than the focal length, it becomes an inverted real delay, the farther the object is from the mirror, the closer the image is to the mirror, and the smaller the image. When the object distance is less than the focal length, it becomes an upright and magnified virtual image, the closer the object is to the mirror, the closer the image is to the mirror, and the smaller the image.

The convex mirror is an upright, shrunken virtual image.

The reason is that concave mirrors converge light, and concave mirrors diverge light.

Question 5: What is the difference between a concave mirror and a concave lens A concave mirror is a concave mirror, which is imaged by the reflection of light (light cannot pass through the mirror), and the concave mirror can be an inverted magnified real image, an inverted reduced real image, and an upright magnified virtual image. (The opposite of Brother Funny Lead has a convex mirror, the rear view mirror of the car).

Concave lenses are imaged by the refraction of light (light can pass through the concave lens), and the concave lens can only be an upright and shrunken virtual image.

First, the center of the concave mirror is on the left, the light spreads from left to right, and the object on the left is the real thing. Since the concave mirror has a reflective effect, if the image is also real on the left, it is virtual on the right.

When the real thing is located at infinity, the light emitted is parallel to the optical axis, and after being reflected by the concave mirror, it converges at the focal point, that is, at the radius of 1 2, which is an inverted and reduced real image.

When the object moves from infinity to the center of the sphere, the resulting image moves from the focal point (at the radius of 1 2) to the center of the sphere, that is, the direction of movement of the image is opposite to the direction of movement of the object, and it is still an inverted and reduced real image. The absolute value of magnification is between 0 and 1.

When the real object moves to the center of the sphere, the image is also in the center of the sphere, which is a handstand, a real image as large as an object. The absolute value of the magnification is 1

When the real thing continues to move from the center of the sphere to the focus of the concave mirror, the image moves from the center of the sphere to the opposite direction, that is, it becomes farther and farther to the left, forming a magnified and inverted real image. The absolute value of magnification is 1

When the object moves to the focal point of the concave mirror, it is like at infinity. At the moment when the real thing passes the focus, the image changes from the virtual and the real, positive and backward, and the position changes from infinity on the left to infinity on the right.

When the object is moved to the right of the focal point of the concave mirror, the image becomes imaginary. When the actual object moves from the focus of the concave mirror to the vertex of the concave mirror, it becomes an enlarged and upright virtual image. The absolute value of magnification is 1

When the object is moved to coincide with the concave mirror, the image is the same size as the object, and the absolute value of magnification is 1At this moment, the virtual reality of the object and the virtual reality of the image change at the same time.

When the object moves to the right again, that is, it becomes a virtual object, and it becomes an upright and shrinking real image, and the absolute value of magnification is 1

Categories: Lifestyle >> Clothing Jewelry.

Problem description: Is it an inverted virtual image? What is the reason for this? Please explain carefully, thank you!

Analysis: The concave lens has a divergent effect on the dust cherry light.

If the direct light from the pattern is direct, then there is also a corresponding pattern on the mirror surface of the concave lens, and the light that makes up the pattern diverges through the concave lens, which will form an enlarged image on the light screen, and the farther the light screen, the larger the image.

If the pattern is diffuse light, then the oak does not form a pattern on the mirror surface of the concave lens, and a spot of light on the pattern will be refracted on the entire concave lens, and the refracted light will be clustered at different positions on the screen, so we can't see the real image.

From this, I came to the conclusion that the pattern of direct light is refracted by a concave lens and becomes an upright and magnified real image; The diffuse light pattern is refracted by the concave lens and becomes an upright and shrinking virtual image.

To be precise, the "real image" formed by the concave lens should be an upright and magnified "shadow".