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CAIE IGCSE Physics 3.2.3.3 Ray Diagrams for the Formation of a Questions

Construct converging-lens ray diagrams with principal rays, using their intersection to locate and describe a real image on a screen.

Syllabus
2026–2028
Course
Physics 0625

Exam points

  • Draw two principal rays through a converging lens to locate the real image.
  • Use intersecting rays to determine where a real image forms on a screen.
  • Use scale diagrams, focal points and image position to calculate or check focal length.

CAIE IGCSE Physics 3.2.3.3 Ray Diagrams for the Formation of a Questions question 1

[Maximum number: 4]

Fig. 6.1 shows a full-scale diagram of an object O and its image I produced by a converging lens. The lens and its position on the principal axis are not shown.

Fig. 6.1

Fig. 6.1

Question (a)

(a)

On Fig. 6.1, draw:
- a single ray to locate the position of the centre of the converging lens
- a line to represent the position of the lens and label the line L.

[ 2 ]

Question (b)

(b)

Determine the focal length of the lens by drawing another ray on Fig. 6.1.

focal length =
[ 2 ]
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