Why is the focal length of the eyepiece of a microscope long and the focal length of the objective l

The question is easy. I'm also in my second year of junior high school. Why does the objective lens of a microscope look like an inverted magnification?

Because the object is between one and two times the focal length of the objective, it will become an inverted magnified image. As you can see, the objective lens of the microscope is very close to the object, but if you think that the object is between one and two times the focal length of the objective lens, then how short do you think the focal length will be? Since the focal length of the objective lens is short, and the eyepiece needs to be magnified twice, the image of the objective lens is within one double the focal length of the eyepiece, so the second magnification is obtained.

Why is the telescope the opposite, because the image of the objective lens is absolutely reduced [for example, if you look at the moon, the image you see through the telescope will not be as big as the moon], so it will be between one and two times the focal length. At this time, the image is already very close to the eyepiece, so the eyepiece needs to have a small focal length to magnify the image formed by the objective.

There is a question of perspective involved here. Go back and look at the physics book, it should be on page p72, go back and combine what I said with the book.

Hope it helps!

Hello, in fact, this is difficult to say simply to understand, simply to put it - I don't know if you can understand, the eyepieces of microscopes and telescopes are very similar.

On the other hand, the microscope is looking at a close-up view, so if you want to get a similar light path from the objective, you must use an objective lens with a very short focal length.

In other words, a telescope is similar to a microscope's eyepiece, but because the microscope is looking at a close-up view, if you still use the objective lens of a telescope, you will not be able to adjust it at all. With a short focal length objective, this is improved.

This is actually more professional in optics, why are you asking this question, it won't be homework.

Alas, don't blame us, it's more complicated for you to ask this question. It stands to reason that students below high school are not easy to understand.

The object distance of the microscope is very small, and the objective lens is magnified, inverted, and solid, so that the object must be placed in the objective lens.

Between one and two times the focal length, so the focal length of the objective lens should be small, and the magnification, inversion, and real image formed by the objective lens should be within one time of the focal length of the eyepiece, and the magnification, uprightness, and virtual image through the eyepiece should be formed (the image of the relative objective lens is upright, and the relative object is inverted), so the focal length of the eyepiece should be large. The telescope object distance is large, large, so the opposite is true.

Teacher Qi for you.

The objective lens of a microscope is equivalent to a projector.

Between the focal length of the objective lens and the double focal length, an inverted magnified real image is obtained, as if it were outside the other double focal length of the objective. The image obtained by the objective lens falls within the focal length of the eyepiece and is magnified by the eyepiece to produce an upright magnified virtual image.

image relative to the objective lens), and finally obtain a virtual image (relative to the object) of the object inverted and magnified

Due to the limited tube size, the focal length of the objective lens should be shorter to obtain greater magnification.

The image of the objective lens should fall within the focal length of the eyepiece, so the focal length of the eyepiece should be long.

The objective of a telescope is equivalent to a camera, and the object is near the focal point of the objective, resulting in an inverted and zoomed out real image, as if between another focal length and two focal lengths of the objective. The image obtained by the objective lens falls within the focal length of the eyepiece, and is magnified by the eyepiece to obtain an upright magnified virtual image (relative to the image of the objective lens), and finally the virtual image of the object is upside down (relative to the object).This is the Kepler telescope.

The telescope in life is the Galilean telescope.

You can get an upright image.

Because the object distance of the telescope is far greater than the double focal length, the image obtained by the objective lens is near the focal point of the objective lens, and the focal length of the objective lens is larger to facilitate the adjustment of the size of the image, and the focal length of the eyepiece does not need to be too large, because the image position obtained by the objective lens does not change much.

If you have any questions, please feel free to ask.

Why does the eyepiece of a telescope have a shorter focal length while the objective lens has a longer focal length.

When using a telescope, in order to make the real image of the distant object through the objective lens as bright as possible, the objective lens should be made larger The larger the objective lens, the more light that can converge, the brighter the image, and the easier it is to observe farther and darker objects The larger the mirror, the longer the focal length of the cluster In order to maximize the angle of view, the distance between the real image formed by the objective lens and the eyepiece should be as close as possible to the focal length of the eyepiece (smaller than the focal length) In order to get more light into the eyepiece (to increase the brightness of the image), The objective lens should be as close to the eyepiece as possible, so the focal length of the eyepiece should be shorter.

1. The eyepiece and objective lens are both convex lenses with different focal lengths.

2. The focal length of the convex lens of the objective lens is smaller than that of the convex lens of the eyepiece. The objective lens is equivalent to the lens of the projector, and the object passes through the objective lens into an inverted and magnified real image. The eyepiece is equivalent to an ordinary magnifying glass, and the real image is formed into an upright and magnified virtual image through the eyepiece.

Objects that pass through the microscope to the human eye become inverted and magnified virtual images.

3. The length of the eyepiece and objective lens is opposite to the magnification. The longer the eyepiece lens, the smaller the magnification; The longer the objective lens, the greater the magnification.

4. The overall magnification of the microscope = the magnification of the eyepiece * the magnification of the objective lens.

Why does the eyepiece of a telescope have a shorter focal length while the objective lens has a longer focal length.

Hello, sorry for the wait! The magnification of the telescope is = objective focal length eyepiece focal length, the objective focal length must be longer than the eyepiece to be greater than 1, so that the magnification effect can be known. If the multiple obtained by the reverse is less than that of the swift 1, it is a dusty and shrinking image.

Telescopes have a long focal length because they can see objects more clearly that cannot be seen with the naked eye. The telescope has two functions, one is to magnify the opening angle of distant objects, and the other is to send objects that cannot be seen by the human eye into the human eye so that people can see. Generally, the ratio of the angle of view of the eyepiece to the angle of incidence of the objective lens is used as an indication of the magnification of the telescope.

The reason why the focal length of the telescope objective lens is longer.

The focal length of the objective lens of the telescope is very long because it can magnify the distant object at a small opening angle at a certain magnification, so that it has a large opening angle in the image space, so that the object that cannot be seen or distinguished by the naked eye becomes more clearly distinguishable, that is to say, the object can be seen more clearly.

The first function of a telescope is to magnify the opening angle of distant objects, allowing the human eye to see details with smaller angular distances. The second function of the telescope is to feed the beam of light collected by the objective lens that is much thicker than the diameter of the pupil into the human eye, so that the observer can see faint objects that were previously invisible.

Generally, the ratio of the angle of view of the eyepiece to the angle of incidence of the objective lens is used as the magnification of the telescope, and the ratio of the focal length of the objective lens to the focal length of the eyepiece is usually used to calculate the magnification of the angle of view of the telescope, such as a telescope with a magnification of 10 times, which refers to the ability to magnify the target with a viewing angle of 1 degree to 10 degrees.

The focal length of the telescope objective lens is greater than the focal length of the front lens of the clear eye. Because in this way, the light emitted (reflected) by distant objects can be gathered through the telescope to achieve the purpose of magnifying the angle of view.

the focal length of the objective lens and eyepiece of the telescope, the focal length of the objective lens is long; The focal length of the microscope eyepiece is long.

I don't know, I can't help you.

？？？I guess the focal length of the eyepiece is relatively short! The focal length of the objective lens is relatively long.

g = f f g is the magnification, f is the objective focal length, and f is the eyepiece focal length. Magnification = objective focal length divided by eyepiece focal length So, the focal length of the eyepiece is shorter, and the focal length of the objective lens is longer.