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  1. JessieN.

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w12_qp_21.pdf 4（b)(iii) plsss help!!! nλ = 2 × 625 is a constant (1250) C1 n = 1 → λ = 1250 outside visible n = 3 → λ = 417 in visible n = 4 → λ = 312.5 outside visible λ=420nm Really...
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