Light Passes Through a Pair of Very Thin Parallel Slits

question 17

Multiple Choice

Light passes through a pair of very thin parallel slits. The resulting interference pattern is viewed far from the slits at various angles θ relative to the centerline coming outward from the midpoint between the slits. The central bright fringe is at θ = 0°. If the central bright fringe has intensity I₀, what is the intensity of the next bright fringe on either side of it?

• A) I₀
• B) I_0/
• C) I₀/2
• D) I₀ cos 15°
• E) I₀ cos² 15°

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