Find the number of photons entering the pupil of our eye per second corresponding to the minimum intensity of white light that humans can perceive $(10^{-10}W/m^2$ ).( Assume area of pupil to be $0.4 cm^2$ , and average frequency of white light to be $6 \times 10^{14}Hz)$

Question

$\begin {array} {1 1} (a)\;1.008 \times 10^4s^{-1} & \quad (b)\;10.08 \times 10^3s^{-1} \\ (c)\;1.008 \times 10^3s^{-1} & \quad (d)\;10.08 \times 10^4s^{-1} \end {array}$