May/June 2026 Paper 23

2026 · 5 questions · 39 parts · 60 marks

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3(a)Superposition InterferenceEasy2 marks
State the principle of superposition.

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3(b)
Parallel rays of coherent light of wavelength 560 nm are incident normally in free space on two narrow slits as shown in Figure 3.1.
Figure 3.1, a double-slit diagram: a double slit with two narrow slits separated by 1.4 x 10^-5 m, and a screen parallel to the slits and 0.43 m away; point X is marked on the screen level with the midpoint between the slits, and point Y is marked above X; labelled not to scale
Light passing through the double slit reaches a screen that is parallel to the plane of the slits. The distance between the centres of the slits is m. The distance between the slits and the screen is 0.43 m.
3(b)(i)Superposition InterferenceEasy1 mark
State what is meant by coherent.
3(b)(ii)Diffraction Diffraction GratingsEasy1 mark
State what happens to the light at the point where it passes through the slits.
3(b)(iii)Superposition InterferenceMedium3 marks
At point X on the screen, there is a central bright fringe.
Explain how this bright fringe is formed.

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3(b)(iv)Superposition InterferenceMedium3 marks
At point Y on the screen, the dark fringe closest to point X is formed.
Calculate the distance XY.
3(c)(i)Superposition InterferenceEasy1 mark
On the screen in Figure 3.1, draw a cross (x) labelled with the letter B at the position of another bright fringe.
Diagram to annotate
PenEraserUndoRedoClear
Draw with the mouse or a finger.
3(c)(ii)Superposition InterferenceEasy1 mark
On the screen in Figure 3.1, draw a cross (x) labelled with the letter D at the position of another dark fringe.
Diagram to annotate
PenEraserUndoRedoClear
Draw with the mouse or a finger.
3(d)Wave Properties Wave BehaviourEasy2 marks
Calculate the frequency of the light in 3(b).