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Here are some more information for Microscope Eyepiece:

Parts of a Microscope

The microscope was invented by two Dutch eyeglass makers named Zacharias Jansen and his father Hans in the year 1590. They put several lenses in to a tube and found out that it can enlarge an object by as much as 9 times its normal size and the images were not so clear. The first microscopes were used more as a novelty item rather than a scientific instrument. Galileo Galilei heard of this new invention and made a better microscope. In the late 1600's, Anthony Van Leeunhoek made use of a real microscope. His microscope had a magnification of 270 times, which during those times other microscopes can only achieve 50 times of magnification. This led to many scientific discoveries and people started seeing things in places where they seem to be empty.

Parts of a Microscope:

• Eyepiece lens - It is the lens where we look through, its magnification is usually 10-15 times.
• Tube - This connects the objective lens and the eyepiece.
• Arm - It gives support to the tube and connects it to the base.
• Base - It supports the whole microscope and is located at the bottom.
• Mirror - Used to reflect light from an external light source to the bottom of the stage. This is used to give light to the specimen on the stage.
• Stage - It is where the slides are placed. The stage has clips to hold the slide in place, it has adjustable knobs that move the platform left and right; and up and down.
• Turret or the Revolving Nosepiece - Two or more objective lenses are in this part. These objective lenses can be rotated to change power.
• Objective lenses - There are usually three objective lenses on a microscope. The shortest lens has the lowest magnifying power and the longest one has the highest magnifying power. The longest lens is retractable because it has a spring in it in order to protect it from hitting the slide.
• Rack Stop - The rack stop keeps users from breaking the lens or slide by preventing them to adjust the lens too low. Factories set this and should only be adjusted when using very thin slides.
• Condenser Lens - Condenser lenses focus light to the specimen making images sharper. They are more useful at the highest powers.
• Diaphragm or Iris - The diaphragm is used to vary the intensity and size of the light that is focused to the slide.

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compare the function of the objective lens of a telescope with the objective lens of a microscope?

1. Compare the function of the objective lens of a telescope with the objective lens of a microscope. In each case:
a. Do you want a large focal length or small? why?
b. Where is your "object"?
c. Where and what kind of image is formed?
2. Compare the function of the eyepiece in both instruments. In each case:
a. Do you want a large focal length or small? why?
b. Where is your "object"?
c. Where and what kind of image is formed?

1) In each case the objective forms a real image of the object.
a)The objective lens of a telescope has a long focal length while that of a microscope has a short focal length. The telescope focuses distant objects, the microscope focuses close objects.
b) for a telescope the object is effectvely at infinity: for a microscope it is very close.
c) In both cases a real image is formed behind the objective.
2) In both cases the eyepiece magnifies the image formed by the objective lens.
a) You want a relatively short focal length in order to focus the real image produced by the objective.
b) The object is within the instrument, behind the objective.
c) It depends on the adjustment of both instruments whether they are set for near point or far point. Usually they are set so that the eye piece forms a virtual image.

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