Which of the following uses vernier scale

Options

A. Meter scale
B. Vernier callipers
C. Spherometer
D. Spectrometer

Answer

To determine which of the following instruments uses a Vernier scale, we can analyze the options provided. The Vernier scale is a precise measuring tool that allows for measurements to be taken with greater accuracy than a standard ruler.

### Step-by-Step Solution:

1. **Identify the Instruments**:
We need to identify the instruments listed in the question. Common instruments that may be listed include Vernier calipers, a spectrometer, a meter scale, and a spirometer.

2. **Understand the Vernier Scale**:
The Vernier scale is a small scale that is used alongside a main scale to provide more precise measurements. It is commonly found in instruments that require high accuracy.

3. **Analyze Each Instrument**:
- **Vernier Calipers**: This instrument is specifically designed with a Vernier scale to measure internal and external dimensions as well as depths.
- **Spectrometer**: This instrument also utilizes a Vernier scale to measure angles accurately when analyzing light spectra.
- **Meter Scale**: A standard meter scale does not use a Vernier scale; it is a simple linear measuring tool.
- **Spirometer**: This device measures the volume of air inhaled and exhaled but does not utilize a Vernier scale for its measurements.

4. **Conclusion**:
Based on the analysis, the instruments that use a Vernier scale are:
- Vernier Calipers
- Spectrometer

### Final Answer:
The instruments that use a Vernier scale are **Vernier Calipers** and **Spectrometer**.