A-LevelPhysicsSuperposition9702/12 · May/June 2010 · Q251 Mark

Using monochromatic light, interference fringes are produced on a screen placed a distance D from a pair of slits of separation a. The separation of the fringes is x. Both a and D are now doubled. What is the new fringe separation?

Ax / 2

C2x

D4x

✓ Correct answer

B: x

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2010 Paper 1 Variant 2, question 25.

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