O-LevelPhysicsLight5054/21 · May/June 2017 · Q47 Marks
Fig. 4.1 shows a converging lens, an object O and the image I produced by the lens. [Figure 4.1]
- (a)(i)Define the term linear magnification.[1]
- (a)(ii)Explain what is meant by real image.[1]
- (b)(i)On Fig. 4.1 a horizontal ray has been drawn from the top of the object to the lens. Continue this ray until it meets the image.[1]
- (b)(ii)Using Fig. 4.1, determine the focal length of the lens.[1]
- (b)(iii)Draw another two rays from the top of the object to show how the image is formed.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [1] image height / object height or image distance / object distance
- [1] rays go to / meet at image or can be formed on a screen
- [1] horizontal ray continued to bottom of I
- [1] 2.4 cm
- [3] any two other rays drawn, e.g. through centre of lens
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