A-LevelPhysicsSuperposition9702/12 · May/June 2019 · Q311 Mark

A student sets up apparatus to observe the double-slit interference of monochromatic light, as shown. [Figure 31.1] Interference fringes are formed on the screen. Which change would increase the distance between adjacent fringes?

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ADecrease the distance between the two slits.

BDecrease the width of each slit.

CMove the screen closer to the double slit.

DUse light of a higher frequency.

✓ Correct answer

A: Decrease the distance between the two slits.

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Topic: Superposition, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2019 Paper 1 Variant 2, question 31.

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