https://file.aiquickdraw.com/mathbot/file/1726766812941wzrrjyuv.jpg

To obtain the correct reading from this Vernier scale, we follow these steps:

1. **Main Scale Reading (MSR):** The main scale shows values in millimeters. From the image, the main scale reading is at **90 mm**, since the 0 line of the Vernier scale is just past this point.

2. **Vernier Scale Reading (VSR):** We now find which Vernier scale line coincides with a line on the main scale. In this case, the 38th division of the Vernier scale aligns perfectly with a division on the main scale.

3. **Final Reading Calculation:**
   - The Vernier scale contributes to the reading by the formula:
     \[
     \text{Vernier Reading} = \text{Vernier Scale Division} \times \text{Vernier Constant}
     \]
     Here, the Vernier constant is **0.02 mm** (as labeled on the scale).

     So, the Vernier reading is:
     \[
     38 \times 0.02 = 0.76 \, \text{mm}
     \]

4. **Total Reading:** Adding the main scale reading and the Vernier scale reading gives:
   \[
   90 + 0.76 = 90.76 \, \text{mm}
   \]

Thus, the correct numerical reading is **90.76**.

Would you like any further explanation or details on how to interpret Vernier scale readings?

### Further questions:
1. What is the role of the Vernier constant in scale readings?
2. How can we improve the precision of Vernier scale measurements?
3. What are the common errors to avoid while reading Vernier calipers?
4. Why is it important for the Vernier scale to have a small least count?
5. How does the design of the Vernier caliper affect its accuracy?

### Tip:
Always ensure your eye is directly above the scale to avoid parallax error when taking measurements.

Make readings from the Vernier scale shown below. (just respond with numerical value without unit)

Learn how to accurately read a Vernier caliper by understanding both the main scale reading and the Vernier scale divisions. This example provides step-by-step guidance on how to calculate the total reading using a Vernier constant of 0.02 mm. Suitable for students in Grades 10-12.

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