CAIE IGCSE Physics Vision Correction Lenses
Practise matching long- and short-sighted image positions to converging or diverging correction lenses and interpret the corresponding eye-ray diagrams.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- identify long-sighted focus behind the retina and select a converging correction lens
- identify short-sighted focus before the retina and select a diverging correction lens
- complete an eye-ray diagram so the chosen lens moves the final focus onto the retina
3.2.3.8—Use of converging and diverging lenses question 1
Question (a)
(a)
Fig. 6.2 shows a simplified diagram of an eye with rays from a near object. The eye needs correction for long-sightedness.
Fig. 6.2
[ 2 ]
Question (i)
(i)
On Fig. 6.2, draw the path of the rays inside the eye to show the effect of long-sightedness.
[ 1 ]
Question (ii)
(ii)
A lens is used to correct the long-sightedness.
Draw a lens suitable for this correction.
lens to correct long-sightedness
[ 1 ]
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