Physics of vision (AQA A-Level Physics): Flashcards

No. of light-detecting cells in human eye

~130 million

Pupil diameter in bright light

~1.5 mm

Pupil diameter in low light

~8 mm

% of eye's total refraction at air-cornea boundary

~60%

Photopigment found in rod cells

Rhodopsin

Cell type that enables colour vision

Cone cells

Cone density at fovea (per mm²)

150,000

Time required for full dark adaptation

~30 minutes

Peak sensitivity wavelength of 'green' cones

530-550 nm

Visual acuity equals

$1/$(min angle in arcmin)