Two magnifiers stacked on top of each other to zoom in or out 20

It depends on how you position the two lenses.

If the distance between them is greater than the sum of their focal lengths, it is equivalent to a Galilean telescope, which can increase the angle of view of the object, that is, it appears to be close.

If it is very close and the object is close (within 1x focal length), it should be zoomed in inverted, but it may not be clear. Because the focal length may not be aligned.

Needless to say, two magnifying glasses are of course magnifying when they are put together, and they are like a magnifying glass to look at the object (which is also a magnifying glass).

Agree with rankinghu, it is said in junior high school physics. The main problem is the focal length, the score is less than double, exactly double, between one and two times, exactly two, more than two, the size of the image and the front and back will be affected.

The convex mirror should be magnification.

Agree with Rankinghu and suggest to him!

The main thing is the problem of focal length.

It should be magnified. You should try it out for yourself and practice it.

It's also zoomed in. I really haven't done physics. A sucker.

This is determined by the imaging principle of the magnifying glass, and the critical point is the focal length f of the magnifying glass. The object distance is within the upright magnified image; Outside the focal length, there is an inverted image; If the distance is far, it is a handstand and a reduced image.

Convex lens imaging is the refraction of light, and the principle is that the convex lens has a converging effect on light. When a convex lens is formed into a real image, the light emitted from a certain point on the object is refracted by the convex lens, and the refracted light intersects at a point, which is the image point of that point on the object.

In the same way, the light emitted by other points on the object is refracted by the convex lens into corresponding image points, and these image points together form a complete image of the object, which can be presented on the optical screen as a real image.

When the convex lens is a virtual image, the light emitted from a certain point on the object is refracted by the convex lens, and the refracted rays cannot intersect, but the reverse extension line of the refracted rays (the dashed line in the figure below) can intersect, and the intersection point is the virtual point of that point on the object. Hypocrisy.

In the same way, the light emitted by other points on the object is refracted by the convex lens into corresponding virtual image points, and these image points together form a complete virtual image of the object, which cannot be presented on the light screen and can be directly observed with the eye.

The characteristic of the magnification when the two magnifiers are overlapped is that the magnification can be increased.

The two magnifiers are superimposed, and the magnification is equal to the product of the magnifications of the two magnifiers. A microscope can actually be seen as a combination of two magnifying glasses (which is actually much more complicated), the eyepiece is a magnifying glass, and the objective lens is also a magnifying glass. If the magnification of the objective lens is 10 and the magnification of the eyepiece is 20, then the magnification of the microscope is 200.

The magnifying glass uses the principle of a convex lens, and the magnification is related to the curvature of the center of the lens, and has nothing to do with the size of the lens. The larger the magnifying glass (convex lens) with a larger thickness in the center, the greater the magnification and the smaller the lens field of view; The smaller the magnifying glass with a smaller center thickness, the smaller the magnification and the larger the lens field of view. The role of a magnifying glass is to magnify the viewing angle.

Historically, the application of the magnifying glass is said to have been proposed by Grostest, a bishop of England in the 13th century.

Introduction to the magnifying glass

Magnifying glasses can be divided into portable magnifying glasses and desktop magnifying glasses according to the classification of appearance, desktop magnifying glasses cave cherry blossoms can be fixed, there is a base below, above is a magnifying glass, the shape of the magnifying glass can be rectangular or square, or round, such a magnifying glass is mainly fixed for a long time to see a place.

Desktop magnifiers can have long arms and bent places, which can be changed at will according to the needs.

Portable magnifying glass is like the above, a round magnifying glass in front and a handle behind it, there are many types of portable magnifying glasses, some magnifying glasses are square, and there are magnifying glasses that can be combined.

Such a magnifying glass is mainly easy to carry and easy to observe. Portable magnifiers also have a light source and a light source, and there are many benefits when there is a light source.

The above content refers to Encyclopedia - Magnifying Glass.

Magnifying glass principle: A simple visual optical device used to observe the details of an object, which is a converging lens. The larger the viewing angle, the larger the image, and the more you can distinguish the details of the object. Moving closer to an object increases the angle of view, but is limited by the ability of the eye to focus.

Magnifying glass principle.

An overview of the principles. Simple visual optics used to observe the details of an object are converging lenses with a focal length much smaller than the photopic distance of the eye. The size of an object imaged on the retina of the human eye is proportional to the angle (angle of view) of the object to the eye. The larger the viewing angle, the larger the image, and the more you can distinguish the details of the object.

Moving closer to an object increases the angle of view, but is limited by the ability of the eye to focus. Use a magnifying glass to keep it close to your eyes and place the object in its focal point to form an upright virtual image. The role of a magnifying glass is to magnify the viewing angle.

The principle is explained in detail. In order to see tiny objects or details of objects, it is necessary to move the object closer to the eye, which can increase the angle of view and create a large real image on the retina. But when the object is too close to the eye, it is impossible to see clearly. In other words, it is necessary to be discerning, not only to have a large enough angle of the object to the eye, but also to take the appropriate distance.

Obviously, these two requirements are mutually restrictive for the eye, and a convex lens in front of the eye can solve this problem. A convex lens is the simplest magnifying glass, a simple optical instrument that helps the eye observe tiny objects or details.

Now take the convex lens as an example to calculate its magnification ability. The object pq is placed between the object focus of lens l and the lens and brought it close to the focal point, so that the object becomes an enlarged virtual image p q through the lens. If the focal length of the image square of the convex lens is 10 cm, the magnifying power of the magnifying glass made of the lens is doubled.

If you only consider the magnification ability, the focal length should be shorter, and it seems that this can get arbitrarily large magnification ability. However, due to the existence of aberrations, the magnification ability generally used is about 3. If a double magnifier (e.g. eyepiece) is used, aberrations can be reduced and magnification can be achieved to 20 .

Focusing Magnifier: A magnifying glass mounted on the focusing cover of a dual-lens reflex camera. Convenient photocopying or microscopy photography requires precise focus at the time. For use with single-lens reflex cameras, it is attached to an eyepiece.

Definitely not, the focal length has limited its distance.

The magnifying glass should magnify the necessary conditions to put things within the focal length of the magnifying glass, if the focal length of the magnifying glass is greater than 2 meters, one or two meters can also be magnified.

A magnifying glass cannot be magnified within a meter or two, the distance is too far.

You can zoom in as far as you go.,It's just that it's far away because the angle is very large, and the scene is also large.,The magnification is very big, so it's very blurry, and you can only see a little thing.。。

The magnifying glass is a convex lens... I can't explain the specifics, and I have long forgotten the knowledge 、、、 junior high school

Here's what to look for: magnifying glasses are convex lenses with a shape that is thick in the middle and thin at the edges. It is generally a transparent medium. As light passes through, a refraction occurs, causing the rays to converge towards the middle.

When looking at an object with a magnifying glass, the object is placed under the magnifying glass and the eyes are on top of the magnifying glass. When the light rays of an object pass through, they are refracted so that the rays converge towards the middle and enter the human eye. And when people look against the light, they feel that the object is magnified!