O-LevelPhysicsLight5054/22 · May/June 2018 · Q66 Marks

A converging lens has a focal length of 3.0 cm. An object of height 2.0 cm is placed 5.0cm from the centre of the lens. Fig. 6.1 shows the arrangement of the object and the lens. [Figure 6.1 (to scale) shows a converging lens, an object (height 2.0 cm, 5.0 cm from the lens), and a grid with 1 cm markings. The focal length is 3.0 cm.]

(a)On Fig. 6.1, draw rays from the top of the object to show how the lens forms an image of the object. Mark the image clearly.[2]
(b)The image is magnified. State one other feature of the image.[1]
(c)Calculate the linear magnification produced by the lens in this case. magnification = .....................................................[2][2]
(d)State the name of one optical device that produces a magnified image as shown by Fig. 6.1.[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2018). The mark or mark type is shown in brackets.

[1] (a) any two of
[1] (a) • ray through middle of lens undeviated
[1] (a) • ray parallel to axis passes through focus, 3 cm from lens
[1] (a) • ray through focus on left of lens parallel to axis after lens
[1] (b) inverted or real
[1] (c) image size / object size or image distance / object distance numerical or algebraic
[1] (c) rays from lens intersect on diagram (for image) and 1.3-1.7
[1] (d) projector or photographic enlarger

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