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HR is a designation for some eyepieces for telescopes. It stands for High Resolution. Some manufacturers market these 6 element eyepieces as planetary eyepieces because if their long eye relief. Be wary of this designation. I have also seen it used in the cheapest 2 and 3 element eyepieces that come with "department store" telescopes.
the function of the swivel in the microscope is to hold up the limb and the stage.
Binocular
Most light microscopes have 10X eyepieces.
because that's what it's called
tae tae the eyepieces
Telescope eyepieces are important of any visual telescope. It is the main part of the telescope and is what determines how the object will look like through the telescope.
types of eyepieces in light microscope
One can purchase telescope related products at Astronomics. Astronomics sells over a 1000 different products including telescopes, eyepieces and much more.
The interpupillary adjustment on the eyepieces of a microscope allows you to change the distance between the eyepieces to match the distance between your eyes. This helps create a single, merged image and prevents eyestrain or double vision while looking through the microscope.
17mm
Early lenses were called eyepieces.