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Chapter 14: Problem 11

If you place a perfectly clear piece of glass in perfectly clear water, you can still see the glass. Why?

Short Answer

Expert verified
Glass can be seen within water because of a change in the refractive index at the water-glass boundary. This change causes the light path to bend, making the glass visible to the human eye.

Step by step solution

01

Understanding Light and Optics

It's essential to understand that light behaves differently when it travels through different media. This difference in behavior is measured by a factor called the 'refractive index'. Air, water, and glass each have different refractive indices. In general, the more 'dense' a medium, the slower light travels through it - and so the higher this medium's refractive index is.
02

Explaining Refraction

Refraction is the process that makes objects placed in a different medium like water or glass visible. When light reaches the boundary between two mediums (like from air to water), it changes direction - that's called refraction. This results in the object appearing 'bent' or 'distorted' compared to its original position when observed through the second medium.
03

Bringing It All Together

Glass can be seen within water due to changes in the refractive index. Even though both glass and water are clear, they have different refractive indices. When light travels from water to glass, it slows down and changes direction, due to the refractive index's change. This change in speed and direction - however slight - causes the light rays to bend, allowing our eyes to detect the presence of the glass in the water.

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