When light passes from a less dense medium to a denser medium (and vice versa),

Question

When light passes from a less dense medium to a denser medium (and vice versa), its path bends. The greater the difference in density between the two, the more the light ray will bend. With that in mind, look at the accompanying figure. A beam passing from air into a glass lens will bend and come to a focus, as shown. If we immerse the lens in an aquarium, how far from the lens will the beam come to a focus? (Assume the following indices of refraction - air: n=1.0, water: n=1.33, glass: n=1.5)

A. Closer to the lens than outside the water

B. Farther from the lens than outside the water

C. At the same distance from the lens as outside the water

D. It won't come to a focus at all - it diverges

Explanation / Answer

B. Farther from the lens than outside the water

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