May/June 2026 Paper 11

2026 · 40 questions · 40 parts · 40 marks

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28Diffraction Diffraction GratingsHard1 mark

Water waves of wavelength

λ

are incident normally on an obstacle with a narrow gap. The width of the gap is equal to

λ

. The waves from the gap emerge over an angle

θ

as shown.

vertical incident water waves approaching an obstacle with a narrow gap of width equal to the wavelength λ; circular emerging water wavefronts spread out beyond the gap over an angle θ measured from the central axis

The gap is slowly widened.

Which changes, if any, occur to

θ

and to the wavelength of the emerging waves?

	$θ$	wavelength
A	decreases	remains the same
B	increases	remains the same
C	remains the same	decreases
D	remains the same	increases