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20. Which of the following statements is correct if the index of refraction of the medium around the optical components changes? The medium is uniform and isotropic. (A) The wavelength of light in a glass plate changes. (B) The focal length of a convex mirror changes. (C) The index of refraction of a lens changes. (D) The size of a single slit diffraction pattern changes, but that of a double slit does not. (E) The transmittance of light through a glass plate changes.

19. A parallel plate capacitor (without a dielectric) is connected in series to a resistor and an AC voltage source. Considering a point between the two plates of the capacitor, which statement is correct? (A) No magnetic field exists because there are no moving charges. (B) Electromagnetic waves are constantly propagating outward between the plates. (C) The direction of the magnetic field is reverse during charging and discharging of the capacitor. (D) The direction of the magnetic field is the same during charging and discharging of the capacitor. (E) Both ( B ) and ( D ) are correct.

18. A single circular wire loop of radius 0.2 m and resistance 2 Ω is placed in a time-dependent magnetic field B as given in Fig.10. The plane of the loop is perpendicular to B. What is the current induced in the loop? (A) 0.019 A at t=0.5 s (B) 1.5 A at t=1.0 s (C) It reaches a maximum within t=2.0 to 4.0 s. (D) 0.03 A within t=4.0 to 6.0 s (E) None *(圖表資訊:一個B(Tesla)對t(s)的圖,包含三個區段: 區段I: t從0到2.0s,B從0增加到0.8 Tesla。 區段II: t從2.0到4.0s,B維持在0.8 Tesla。 區段III: t從4.0到6.0s,B從0.8 Tesla減少到0。)*

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