Traveling microscope
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A traveling microscope is an instrument for measuring length with a resolution of about 0.05 -0.1 mm. It is composed of a microscope mounted on two rails fixed to a supporting structure. The position of the microscope can be varied coarsely by sliding along the rails, or finely by turning a screw. Position of the microscope is read by a vernier. Purpose of the microscope is to aim at reference marks with much higher accuracy compared with bare eyes.It is used in labs to measure refractive index of liquids using the geometrical concepts of ray optics.
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