Question

已知玻璃的折射率为 1.50，水的折射率为 1.33

Answer 1

更新1:

可迹源以把回答握州旅翻成段凳中文吗

Statement (3) is correct. Refractive index (折射率) from water to glass = refractive index of glass/refractive index of water = 1.5/1.33 = 1.13 Since the focal length (焦距) of a convex lens (凸透镜) decreases with the increase of refractive index (the Lens' Maker's Formula)
now the refractive index decreases from 1.5 to 1.13
the focal length of the lens in water is then longer than 10 cm