A human eye has a near point of 1.25 m1.25\text{ m}1.25 m.
State the name of this defect of vision.
Calculate the power of the correcting lens required for this eye to focus on objects clearly at the normal near point of 0.25 m0.25\text{ m}0.25 m.
An eye with astigmatism requires the following prescription:
+2.25−0.50×80 +2.25 \quad -0.50 \quad \times 80 +2.25−0.50×80Which of the following options correctly identifies the meaning of each value in order from left to right?
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.