O-LevelPhysicsLight5054/22 · May/June 2014 · Q66 Marks

(a) A beam of parallel light strikes a converging lens of focal length 2.8 cm. The width of the beam before it reaches the lens is 1.0cm. The width changes on the other side of the lens. State a distance from the lens where the width of the beam is

(a)(i)less than 1.0cm,[1]
(a)(ii)more than 1.0cm.[1]
(b)(i)An object is placed 3.0cm from a converging lens of focal length of 2.8cm. Fig. 6.1 is an incomplete, full-scale ray diagram for this arrangement. On Fig. 6.1, draw the paths of the two rays after they pass through the lens. [Figure 6.1][2]
(b)(ii)Explain how your ray diagram shows that the image is more than 11 cm from the lens.[1]
(b)(iii)Underline three of the following words which describe the image. diminished inverted magnified real upright virtual[1]

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Mark scheme

Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.

[B1] (a) (i) any single value between 0 and 5.6 cm or a range all of whose values are correct
[B1] (ii) any value beyond 5.6 cm
[B1] (b) (i) ray through optical centre undeviated
[B1] other ray correct through or to axis 2.8 cm (± 1½ small square) from lens
[B1] (ii) lines drawn meet after 11 cm or rays do not meet (on page) or rays almost parallel
[B1] (iii) inverted, magnified, real all 3 needed and none wrong

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