An archivist diagnosed with hypermetropia (long-sightedness) wears corrective spectacle lenses of power +1.5 D+1.5\text{ D}+1.5 D. This allows them to just focus clearly on fine manuscript text when it is held 25 cm25\text{ cm}25 cm from the spectacles.
Explain why the unaided defective eye cannot form a clearly focused image of the manuscript text when it is held 25 cm25\text{ cm}25 cm from the eye.
Calculate the distance of the image formed by the spectacle lens when the manuscript is placed 25 cm25\text{ cm}25 cm from the lens. Give your answer to a suitable number of significant figures.
State the name for the position where the image is formed by the spectacle lens.
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.