Suppose you could take a converging lens underwater and try to focus the sun on the bottom of a swimming pool. You will find that
A) the lens has to be closer to the image than in air.
B) the lens has to be the same distance to the image as in air.
C) the lens has to be farther from the image than in air.
D) in general an image can't be formed at all.

Question

Quizplus · Accepted Answer

The refractive index of water is higher than that of air, which means light bends more when entering water. For a converging lens to focus light to a point (form an image) underwater, it needs to bend the light less than in air because the water itself also bends the light. Therefore, the lens has to be farther from the image than in air to achieve focus.

Suppose You Could Take a Converging Lens Underwater and Try