11. Parallel light rays cross interfaces from medium 1 into medium 2 and then into medium 3. What is the correct relation of the index of refraction of these media? (A) n1 ＞ n2 ＞ n3 (B) n3 ＞ n2 ＞ n1 (C) n2 ＞ n3 ＞ n1 (D) n1 ＞ n3 ＞ n2 (E) none of the above

14. Which following statement regarding the electric field or potential is correct? (A) The electric field at a short distance above a single plane, with uniform surface charge density σ, has the magnitude E =σ/ε0, where ε0 is permeability in air. (B) The electric field at any point between two parallel infinite conducting plates, each with uniform surface charge density σ, has the magnitude E =σ2/ε0. (C) The electric field at any point outside two parallel infinite conducting plates, each with uniform surface charge density σ, has the magnitude E = 0. (D) The electric potential at any point between two parallel infinite conducting plates, each with uniform surface charge density σ, has constant value.

11. Parallel light rays cross interfaces from medium 1 into medium 2 and then into medium 3. What is the correct relation of the index of refraction of these media?

(A) n₁ ＞ n₂ ＞ n₃
(B) n₃＞ n₂ ＞ n₁
(C) n₂ ＞ n₃ ＞ n₁
(D) n₁ ＞ n₃ ＞ n₂
(E) none of the above

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