The fovea in a typical human eye consists of cones which have an average diameter of 1.6×10−6 m1.6 \times 10^{-6}\text{ m}1.6×10−6 m.
An eye looks directly at two point sources of light which are 14 mm14\text{ mm}14 mm apart at a distance of 70 m70\text{ m}70 m from the centre of the eye lens. The fovea is at the centre of the retina at a distance of 22 mm22\text{ mm}22 mm behind the centre of the eye lens.
Deduce whether the eye would be able to resolve the two images formed at the fovea.
Three types of cone (blue, green, and red) are present at the fovea. Describe the characteristic features of their spectral sensitivity (relative light absorption vs. wavelength from 300 nm300\text{ nm}300 nm to 800 nm800\text{ nm}800 nm), including their relative peak order (from shortest to longest wavelength), relative peak heights, and typical absorption wavelength ranges.
11 exam-style questions on AQA A Level Physics Physics of the eye (A-level only), covering Physics of vision (A-level only) and Defects of vision and their correction using lenses (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.