If the intensity of incident light is increased in photoelectric emission, then which of the following is true?

In the photoelectric experiment, if we use a monochromatic light, the $I-V$ curve is as shown. If work function of the metal is $2\mathrm{eV},$ estimate the power of light used. (Assume efficiency of photo emission is ${10}^{-3}\%,$ i.e. number of photoelectrons emitted are ${10}^{-3}\%$ of number of photons incident on metal.)