Why do we use a microscope to observe newton's ring? Can short focal distance telescope be used instead?

Question

In newtons ring experiment we place the lens setup below a microscope which is then moved vertically until the fringes can be seen.

In case of Determination of Cauchy's constants, we use a spectrometer. The spectrometer consists of a collimator which is mounted on the rigid arm and a telescope mounted on the rotation table arm which can rotate in a horizontal plane about the axis of the instrument. A prism table of adjustable height is mounted along the axis of rotation of the telescope.

Is there any problem if we use a telescope to view newton's rings?

useful info:
newtons ring experiment link ,
cauchy constants experiment link

niels nielsen · Answer

A telescope can be thought of as a microscope with a very long working distance between the subject and the objective lens. Such a long-working-distance microscope is used when the experimental setup does not allow for the microscope to be located close to the subject.

Answered by niels nielsen on November 12, 2020

Farcher · Answer

I think that the link that you have given for Millikan's experiment is misleading in that the name normally used for the device which they call telescope in that link is in fact called microscope as in this link.

A telescope is a device which make distant object appear nearer and so they appear to be bigger.
A microscope is a device which makes very small objects appear to be bigger.

In the Millikan experiment you are observing very small oil drops and so a microscope is the appropriate device.

Why do we use a microscope to observe newton's ring? Can short focal distance telescope be used instead?

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