A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier callipers is + 0.02 cm, what is the correct thickness of pencil ?

Explanation

To find the correct thickness of the pencil measured with a vernier caliper, we need to account for the zero error. Here’s a step-by-step solution:

### Step 1: Identify the observed reading
The boy measures the thickness of the pencil to be:
- **Observed Reading (OR)** = 1.4 mm

### Step 2: Convert the zero error to the same unit
The zero error of the vernier caliper is given as:
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