What Is A Traveling Microscope?
Travelling Microscope is mainly required when you need to determine small distance. It works with an accuracy of 0.001 cm. The purpose of having this scope is to aim at the marks of reference with a greater accuracy than the possible accuracy of our naked eye. Also, it is utilized in labs to measure the refractive indices of liquids with the help of ray optics. Also, they are used to measure short distances accurately.
Principle of Travelling Microscope:
The principle of this travelling optical instrument is based on the principle of Verniercaliper. The measurement is very similar to it. The main scale divisions of the scope are of the magnitude 0.5 mm each and the Vernier scale has around 50 divisions.
Accuracy and least count:
The least count of the travelling microscope is calculated by the number of main scale divisions divided by the Vernier scale divisions. Thus, 0.05/50 is 0.001 cm.
How to take the reading with the instrument?
When you are using this scope, in the horizontal scale, look at the zero of the Vernier scale. Then, find out the division on the main scale just before the zero division. Now this will be your MSR or main scale reading. Then, you look at the Vernier scale. One of the fifty lines will come exactly in par with the main scale line, that will be your Vernier reading.