A-LevelPhysicsSuperposition9702/12 · May/June 2018 · Q291 Mark
A two-source interference experiment uses the apparatus shown. [Diagram] What is the main purpose of the single slit?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Ato make a narrow beam of light
Bto make the same amplitude of light incident on each slit
Cto provide coherent light
Dto provide monochromatic light
✓ Correct answer
C: to provide coherent light
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