A focal length of a lens 10cm. What is power of a lens in dipotre?

Options

A. 0.1D
B. 10D
C. 15D
D. 1D

Explanation

To find the power of a lens given its focal length, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Formula for Power**:
The power \( P \) of a lens is given by the formula:
\[ P = \frac{1}{f} \]
where \( f \) is the focal length in meters.

2. **Convert Focal Length to Meters**:
The given focal length is 10 cm. We need to convert this into meters:
\[ f = 10 \text{ cm} = \frac{10}{100} \text{ m} = 0.1 \text{ m} \]

3. **Substitute the Focal Length into the Power Formula**:
Now, we can substitute the focal length in meters into the power formula:
\[ P = \frac{1}{0.1} \]

4. **Calculate the Power**:
Performing the calculation:
\[ P = 10 \text{ diopters} \]

5. **Final Answer**:
Thus, the power of the lens is:
\[ P = 10 \text{ D} \]

### Summary:
The power of the lens with a focal length of 10 cm is 10 diopters.