A-LevelPhysicsSuperposition9702/12 · Feb/Mar 2018 · Q271 Mark

Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. [Figure 27.1] What is the path difference between 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, Feb/Mar 2018 Paper 1 Variant 2, question 27.

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