Figure 23–67 shows a liquid-detecting prism device that

Chapter 23, Problem 86GP

(choose chapter or problem)

Figure 23–67 shows a liquid-detecting prism device that might be used inside a washing machine. If no liquid covers the prism’s hypotenuse, total internal reflection of the beam from the light source produces a large signal in the light sensor. If liquid covers the hypotenuse, some light escapes from the prism into the liquid and the light sensor’s signal decreases. Thus a large signal from the light sensor indicates the absence of liquid in the reservoir. Determine the allowable range for the prism’s index of refraction \(n\).

FIGURE 23–67 Problem 86.

Equation Transcription:

Text Transcription:

n

45°

n

45°

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