Given data are scotopic vision = 3.9x10-11 W/m2
diameter(d) = 8.4mm => radius =4.2mm=0.0042m
i just taken wavelength as (as WAVELENGTH VALUE SIDE IS CROPPED IN given QUESTION's IMAGE) .so you can substitute any value of LAMBDA in the below equation and get your anser.
Using
for the energy of each photon at this wavelength.
To turn the threshold which is a power/area into energy/sec
we have to multiply by the area of the pupil which is
and then the energy/sec
This then is
Therefore the number of photons per second can enter the eye will be 5,402
Note: in your given question "central wavelength" is not given (or cropped) but i just assumpted a value of 500nm,so in place of that you can replace the original value what you have and get your answer.
thank you .. hope will get positive RATING
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Need Help? Read ItWatch t 3. 0/7.14 points l Previous Answers SerCP11 1.4P 011 How many significant figures are there in each of the following? (a) 64.8 ± 0.8 (b) 4.16 x 10% Your response differs significantly from the correct answer Rework your solution from the (c) 2.8200 x 1076 Your response differs significantly from the correct answer. Rework your solution from the i (d) 0.0027 Your response differs from the correct answer by more than 10%. Double check your...