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Gaokao Physics Practice Question

一束由红、蓝两单色光组成的光线从一平板玻璃砖的上表面以入射 角 $\theta$ 射入, 穿过玻璃砖从下表面射出, 已知该玻璃对红光的折射率为 1.5 , 设红光与蓝光穿过玻璃砖所需时间分别为 $\mathrm{t}_{1}$ 和 $\mathrm{t}_{2}$, 则在 $\theta$ 逐渐由 $0^{\circ}$ 增大到 $90^{\circ}$ 的过程中

  1. A.$\mathrm{t}_{1}$ 始终大于 $\mathrm{t}_{2}$
  2. B.$\mathrm{t}_{1}$ 始终小于 $\mathrm{t}_{2}$
  3. C.$t_{1}$ 先大于后小于 $t_{2}$
  4. D.$\mathrm{t}_{1}$ 先小于后大于 $\mathrm{t}_{2}$

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