Minimum light intensity that can be perceived by normal human eye is about `10^(-10) Wm^(-2)`.
Channel: Doubtnut
Date: 2020-08-30

Minimum light intensity that can be perceived by normal human eye is about `10^(-10) Wm^(-2)`. What is the minimum number of photons of wavelength 660 nm that must enter the pupil in one second, for one to see the object?Area of cross-section of the pupil is `10^(-4)m^(2)`?