2. Tutorial (Measuring Procedure)
PV6253-F4E016 6
(2) How to find the front spot (How to discriminate between the front spot and the back
surface spot.)
1) When the light donuts are laid one over the other concentrically, lower the Z-stage
gradually while looking into the right-hand eyepiece, with the lens under
measurement brought close to the objective. Then, the back surface will come into
focus in the position shown in Figure 4, forming a spot.
2) Then, as the Z-stage is gradually lowered by the thickness of the lens under
measurement, the front surface will now come into focus in the position shown in
Figure 5, and a spot, formed.
Figure 4 Figure 5
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