O-LevelPhysicsLight5054/21 · May/June 2021 · Q56 Marks

Fig. 5.1 shows part of the ray diagram of a lens being used as a magnifying glass. Three rays are shown coming from the top of an object O. The points labelled F are one focal length from the lens. [Figure 5.1]

(a)State the name of the type of lens shown in Fig. 5.1.[1]
(b)Describe what happens to the ray of light R: • as it enters the lens • as it leaves the lens.[2]
(c)Using all three rays from O, complete Fig. 5.1 to show the image formed.[2]
(d)Underline all of the words in the list that describe the image formed in (c). inverted upright real virtual[1]

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 2021). The mark or mark type is shown in brackets.

[B1] convex or converging
[B1] as it enters - refracts (towards normal) or changes speed
[B1] as it leaves, one of: bends/refracts away from normal; speed increases; wavelength increases; emerges parallel to the (principal) axis
[B1] either emergent ray R or the ray through F extended to the left of the lens
[B1] both ray through F and R shown and image marked at intersection of extended rays
[B1] upright and virtual

On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.