2023 · M/J · 5054/21 | Q6

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Question (6 of 11)6 marks · Practise this topic →

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Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.

The virtual reality headset in Fig. 6.1 contains a display and a lens, as shown in Fig. 6.2. The display is the object for the lens. The lens acts as a magnifying glass and forms a virtual image of the display.

(a)(i)Describe where the display must be positioned relative to the focal length of the lens for the lens to act as a magnifying glass for the image on the display.

Fig. 6.1 — see the question text for what it shows

Fig. 6.2 — see the question text for what it shows

Answer guidance

Describe Say what happens, in order. Reasons are not required unless the question also asks why.

[1 mark]

(a)(ii)Explain how a virtual image is formed.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[1 mark]

(b)(i)An arrow on the display is 3.4 cm from the lens. The virtual image of the arrow is 22 cm from the lens. Fig. 6.3 shows the arrow O, the lens L and the virtual image of the arrow I, drawn on a grid with a scale of 1:2. On Fig. 6.3, draw a ray diagram to show the formation of the virtual image I.

Fig. 6.3 — see the question text for what it shows

[3 marks]

(b)(ii)An arrow on the display is 3.4 cm from the lens. The virtual image of the arrow is 22 cm from the lens. Fig. 6.3 shows the arrow O, the lens L and the virtual image of the arrow I, drawn on a grid with a scale of 1:2. Determine the focal length of the lens. Give your answer in cm.

Answer guidance

Determine Work it out from what you are given or from the figure, and show how you got there.

[1 mark]

5054/21/M/J/23Cambridge O Level Physics 5054 · May/June 2023 · Paper 2 variant 1 · Question 6