A point source is suspended at a height \(h=1.0 \mathrm{~m}\) over the centre of a round table of radius \(R=1.0 \mathrm{~m} .\) The luminous intensity \(I\) of the source depends on direction so that illuminance at all points of the table is the same. Find the function \(I(\theta),\) where \(\theta\) is the angle between the radiation direction and the vertical, as well as the luminous flux reaching the table if \(I(0)=I_{0}=100 \mathrm{~cd}\).