Figure 1 shows a macro photography setup where a single converging lens is used to project a sharp, focused image of a small insect onto a digital sensor.
The measured distances for this camera setup are:
- Distance from the object (insect) to the lens, u=18 cmu = 18\text{ cm}u=18 cm
- Distance from the lens to the sensor, v=90 cmv = 90\text{ cm}v=90 cm
Calculate the focal length, fff, of the camera lens.
Use the equation:
1f=u+vu×v \frac{1}{f} = \frac{u+v}{u \times v} f1=u×vu+v