A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2011 · Q281 Mark

Two light sources produce visible interference fringes only in certain circumstances. Which condition enables visible interference fringes to be formed?

Ausing a white light source

Busing incoherent sources

Cusing one light source which is polarised at right angles to light from the other source

Dusing sources from which the light does not overlap

✓ Correct answer

A: using a white light source

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2011 Paper 1 Variant 2, question 28.

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