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Chapter 25: Q5PE (page 929)

What is the speed of light in water? In glycerin?

Short Answer

Expert verified

The speed of light in the water is:VW=2.25脳108m/s.

The speed of light in the glycerin is: vg=2.04脳108m/s.

Step by step solution

01

Concept Introduction

Light slows down when it travels from air to water, causing it to alter direction somewhat. Refraction is the term for this shift in direction. Light 'bends' further towards the normal line when it penetrates a denser medium (higher refractive index).

02

Calculating the speed of light in water

The relationship n=cvmodifies the speed of light in materials by altering its coefficient of refraction. The coefficient of refraction of water is nw=1.333, while that of glycerin is ng=1.473, based on the values in the table 25.I. Accordingly,

vw=cnw=3.00脳108m/s1.333=2.25脳108m/svg=cng=3.00脳108m/s1.473=2.04脳108m/s

Therefore, the speed of light in the water and glycerin is:vw=2.25脳108m/sandvg=2.04脳108m/s.

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Most popular questions from this chapter

When you focus a camera, you adjust the distance of the lens from the film. If the camera lens acts like a thin lens, why can it not be a fixed distance from the film for both near and distant objects?

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