Q&A

Why does a microscope objective require a short focal length lens?

Why does a microscope objective require a short focal length lens?

A lens with a shorter focal length will have a higher lens strength and will enlarge the image more. Microscope objectives have short focal lengths to greatly enlarge the images.

Why is objective of a microscope of short aperture and short focal length?

The convex lens that is close to the object is known as objective lens and the lens placed near to the eye is known as eye piece. Objective lens has small focal length and small aperture because for small focal length it is necessary to have small aperture.

Why should both eyes be open when using the microscope?

If you do this, it is important to keep both eyes open in order to avoid eyestrain. This will allow you to “see” only with the eye you are looking through the microscope with even though the other eye is open. In any case, practice keeping both eyes open while looking through the microscope.

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What does the eyepiece do on a microscope?

The eyepiece, or ocular, magnifies the primary image produced by the objective; the eye can then use the full resolution capability of the objective. The microscope produces a virtual image of the specimen at the point of most distinct vision, generally 250 mm (10 in.) from the eye.

Which lens has more power eyepiece or objective?

The eyepiece, also called the ocular lens, is a low power lens. The objective lenses of compound microscopes are parfocal. The depth of focus is greatest on the lowest power objective. Each time you switch to a higher power, the depth of focus is reduced.

What must be the size of objective in compound microscope?

The field of view of the eyepiece is usually set to be a standard size of about 20 mm (0.8 inch) diameter. The field of view of the objective is then set to range from 10 mm (0.4 inch) for an objective with a magnifying power of 2× to 0.2 mm (0.008 inch) for an objective with a magnification of 100×.

Why is objective of a compound microscope?

A compound microscope is one that contains multiple lens elements. It works similar to a simple magnifier which utilizes a single lens to magnify a small object in order for the human eye to discern its details. The objective, located closest to the object, relays a real image of the object to the eyepiece.

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Why should the objective of a telescope have large focal length and large aperture?

The objective of a telescope have large focal length and large aperture because large focal length enhances the magnifying power of the telescope and large aperture help in collecting large amount of light coming from the object so that a bright image is obtained.

What are the consequence of not using both eyes when looking through microscope eyepieces?

It may seem difficult, but your eye will automatically shut out the image from the eye not used for viewing through the monocular microscope, and with the binocular microscope, both eyes will focus on the image.

Why should you carry the microscope with both hands?

When moving your microscope, always carry it with both hands (Figure 1, at left). Your microscope slide should be prepared by placing a coverslip or cover glass over the specimen. This will help protect the objective lenses if they touch the slide.

What is the maximum magnification of a compound microscope?

Now, most compound microscopes use an optical tube of about 25 mm diameter. The eyepiece fits inside that, and so the maximum clear aperture available for the real image from the objective is about 20 mm. The most common eyepiece magnification seems to be 10 X, which has a focal length of 25 mm.

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How does eyepiece focal length affect magnification?

In the second phase of magnification, an eyepiece magnifies the first image and the amount of magnification is greater with a shorter focal length. In general the eyepiece focal length will be close to the low magnification objective focal length, but much bigger than the med or high magnification objectives.

What should be the UO and Fo for a large magnification?

Now for large magnification, m is to be large, so fe should be small and uo should be small. Now object is placed at a distance uo from the objective which is slightly greater than its focal length fo. So for uo to be small, fo should also be small.

Can you get lower magnification eyepieces with higher FOV?

You can get lower-magnification eyepieces, but they can’t have a larger real FOV if the optical tube is the same size, because the real FOV is limited by the tube diameter. So they just have smaller, brighter images and more eye relief.