Physics of vision (AQA A-Level Physics): Flashcards
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No. of light-detecting cells in human eye
No. of light-detecting cells in human eye
~130 million
Pupil diameter in bright light
Pupil diameter in bright light
~1.5 mm
Pupil diameter in low light
Pupil diameter in low light
~8 mm
% of eye's total refraction at air-cornea boundary
% of eye's total refraction at air-cornea boundary
~60%
Photopigment found in rod cells
Photopigment found in rod cells
Rhodopsin
Cell type that enables colour vision
Cell type that enables colour vision
Cone cells
Cone density at fovea (per mm²)
Cone density at fovea (per mm²)
150,000
Time required for full dark adaptation
Time required for full dark adaptation
~30 minutes
Peak sensitivity wavelength of 'green' cones
Peak sensitivity wavelength of 'green' cones
530-550 nm
Visual acuity equals
Visual acuity equals
(min angle in arcmin)