Question

l.c = 0.01cm

Explanation:

Step1: Note main scale reading (MSR)

The main scale reading is the value on the main scale just before the vernier scale's zero mark. Here, $\text{MSR} = 0.6\ \text{cm}$

Step2: Note vernier coincidence (VC)

The 8th division of the vernier scale aligns perfectly with a main scale division, so $\text{VC} = 8$

Step3: Calculate vernier scale contribution

Vernier scale reading = $\text{VC} \times \text{Least Count}$. Given $\text{LC} = 0.01\ \text{cm}$, so:
$\text{VSR} = 8 \times 0.01 = 0.08\ \text{cm}$

Step4: Total reading calculation

Total reading = $\text{MSR} + \text{VSR}$

Answer:

$0.6 + 0.08 = 0.68\ \text{cm}$