Sunlight of intensity $1.3 \mathrm{kWm}^{-2}$ is incident normally on a thin convex lens of focal length 20 cm . Ignore the energy loss of light due to the lens and assume that the lens aperture size is much smaller than its focal length. The average intensity of light, in $k W m^{-2}$, at a distance $22 c m$ from the lens on the other side is $\_\_\_\_$ .