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Asked in GUJCET 2017 · Fringe width and fringe position
Given: d = λ in a two-slit experiment.
Idea: a bright fringe needs d sin θ = nλ, and sin θ can only lie between -1 and +1, which caps the order.
With d = λ the condition becomes sin θ = n, so the only allowed orders are n = -1, 0, +1.
That is the central maximum together with one first-order maximum on each side, those two lying at θ = 90°, along the plane of the slits.
The maximum number of bright fringes is 3.
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