The minimum intensity of light to be detected by human eye is 10⁻¹⁰ ~W / m ^2 . The number of photons of wavelength 5.6 10⁻⁷ ~m entering the eye, with pupil area 10⁻⁶ ~m ^2 , per second for vision will be nearly

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Correct answer: C. 300

On using I= P A ; where P= radiation power P=I A n h c t =I A n t = I A h c Hence, number of photons entering per sec the eye ( n t )= 10⁻¹⁰ 10⁻⁶ 5.6 10⁻⁷ 6.6 10⁻³⁴ 3 10^8 =300

The minimum intensity of light to be detected by human eye is 10⁻¹⁰ ~W / m ^2 . The number of photons of wavelength 5.6 10⁻⁷ ~m entering the eye, with pupil area 10⁻⁶ ~m ^2 , per second for vision will be nearly

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