পদার্থবিজ্ঞান প্রশ্ন

Man can tolerate minimum light of intensity of 10-10 Wm-2 . If the area of the eye ball is 0.4cm2 and frequency of light s 6×1014 Hz, then how many photos will enter into eyes per second? ( Planck's constant, h =6.63×10-34  Js)