A-LevelPhysicsSuperposition9702/12 · Oct/Nov 2016 · Q271 Mark

Observable interference fringes are produced using light from a double slit. The intensity of the light emerging from each slit is initially the same. The intensity of the light emerging from one of the slits is now reduced. How does this affect the interference pattern?

AThe bright fringes and the dark fringes all become brighter.

BThe bright fringes and the dark fringes all become darker.

CThe bright fringes become brighter and the dark fringes become darker.

DThe bright fringes become darker and the dark fringes become brighter.

✓ Correct answer

D: The bright fringes become darker and the dark fringes become brighter.

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2016 Paper 1 Variant 2, question 27.

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