A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2022 · Q291 Mark

Light of a single frequency is incident on a pair of narrow slits that are a distance of 0.10 mm apart. A series of bright and dark fringes is observed on a screen a distance of 2.0m away. The distance between adjacent bright fringes is 8.0 mm. [Figure showing double slit interference setup] What is the path difference of the light waves from the two slits that meet at the second-order dark fringe?

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A2.0 x 10⁻⁷ m

B4.0 x 10⁻⁷ m

C6.0 x 10⁻⁷ m

D8.0 x 10⁻⁷ m

✓ Correct answer

C: 6.0 x 10⁻⁷ m

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2022 Paper 1 Variant 2, question 29.

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