The formula to calculate the Focal Distance is:
\[ FD = \frac{R}{2} \]
Where:
Focal distance is the distance from the lens or mirror to the focal point, where parallel rays of light converge or appear to diverge. It is an important parameter in optics, determining the focusing power of lenses and mirrors.
Example:
Step 1: Calculate the Focal Distance:
\[ FD = \frac{100}{2} = 50 \text{ mm} \]
