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The pupil allows light to pass through it and has a diameter of 2×10^{-3}m.If minimum light intensity that should enter the eye is 1.8×10^{-10}W/m^2,then find the number of photon in the visible range that must enter the pupil to have vision. Wavelength of photon in visible range can be taken as 5,500 A. |
| Answer» The pupil allows light to pass through it and has a diameter of 2×10^{-3}m.If minimum light intensity that should enter the eye is 1.8×10^{-10}W/m^2,then find the number of photon in the visible range that must enter the pupil to have vision. Wavelength of photon in visible range can be taken as 5,500 A. | |