If a vernier scale is provided, how would you determine the reading?

To determine the reading on a vernier scale, the correct approach involves identifying the markings that align precisely between the main scale and the vernier scale. The vernier scale enhances the precision of the measurement by allowing the user to read values that are not whole divisions on the main scale.

When you take a measurement, you first note the value on the main scale just before the zero of the vernier scale. Then, you look along the vernier scale to find which line aligns perfectly with a line on the main scale. The value of that aligned line on the vernier scale adds an additional decimal value to the main scale reading, giving a more accurate measurement.

The other available options do not accurately facilitate a proper reading from a vernier scale. Averaging the two scales is not a standard practice, and the maximum point does not provide a clear measurement. Lastly, merely taking the last visible decimal place without considering proper alignment does not yield an accurate reading either.