The image is not seen. 2. In an experiment with Foucault's apparatus,

The image is not seen. 2. In an experiment with Foucault's apparatus, the various distances used are as follows: Distance between the rotating and the fixed mirror $=16 \mathrm{~m}$ Distance between the lens and the rotating mirror $=6 \mathrm{~m}$, Distance between the source and the lens $=2 \mathrm{~m}$. When the mirror is rotated at a speed of 356 revolutions per second, the image shifts by $0.7 \mathrm{~mm}$. Calculate the speed of light from these data.