CAIE IGCSE Physics 3.2.3.6 Ray Diagrams for the Formation of a Questions

Practise predicting the image change when an object moves inside a converging lens's focal length, distinguishing the resulting virtual upright image from a real one.

Exam points

Identify a virtual upright image when the object is closer to a converging lens than its focal length, and contrast it with a real inverted image beyond focus.

[Maximum number: 4]

Fig. 6.1 shows a thin converging lens used to produce a magnified image of an object AB.

Fig. 6.1

On Fig. 6.1, draw the magnified image of AB. Show your working.

any two from:

- ray from top of object to lens, parallel to principal axis, refracted to $F_{2}$

- ray from top of object through centre of lens, undeviated

- ray from $F_{1}$ , through top of object and on to lens, then parallel to principal axis
rays extrapolated back to converge to the left of $\mathrm{F}_{1}$
image drawn from principal axis to intersection with arrow (to show orientation)

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CAIE IGCSE Physics 3.2.3.6 Ray Diagrams for the Formation of a Questions question 1