question_answer

The minimum intensity of light to be detected by human eye is \[\frac{3\pi }{4}\]The number of photons of wavelength \[\sum\limits_{m=1}^{n}{{{\tan }^{-1}}}\left( \frac{2m}{{{m}^{4}}+{{m}^{2}}+2} \right)\]entering the eye, with pupil area \[{{\tan }^{-1}}\left( \frac{{{n}^{2}}+n}{{{n}^{2}}+n+2} \right)\]per second for vision will be nearly

A) 100                                        

B) 200

C) 300                                        

D) 400