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what is the outer diameter of the cylinder?
mm

Explanation:

Step1: Read the main scale

The main scale reading is \( 26\ \text{mm} \).

Step2: Read the vernier scale

The vernier scale has a least count of \( 0.05\ \text{mm} \). The \( 12^{\text{th}} \) vernier scale division coincides with a main - scale division. So the vernier scale reading is \( 12\times0.05 = 0.6\ \text{mm} \).

Step3: Calculate the outer diameter

The outer diameter \( D=\text{Main scale reading}+\text{Vernier scale reading}\). So \( D = 26+0.6=26.6\ \text{mm} \).

Answer:

\( 26.6\ \text{mm} \)