NEET 2021 Model Test Paper 6

Question : 18 of 180

Marks: +1, -0

The minimum intensity of light to be detected by human eye is 10‌−10 W/m‌2 . The number of photons of wavelength 5.6 × 10‌−7 m entering the eye, with pupil area 10‌−6 m‌2 , per second for vision will be nearly :-