Question

Figure beside shows a liquid-detecting prism device that might be used inside a washing machine or other liquid-containing appliance. 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. This device is designed to detect the presence of water whose index of refraction is 1.33.

          Figure beside shows a liquid-detecting prism device that might
be used inside a washing machine or other liquid-containing
appliance. 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. This
device is designed to detect the presence of water whose index
of refraction is 1.33.

$Figure beside shows a liquid-detecting prism device that might be used inside a washing machine or other liquid-containing appliance. If no liquid covers the prism's hypotenuse, total internal reflection of the beam from the light source produces a large signal in the light sensor. If liquid covers the hypotenuse, some light escapes from the prism into the liquid and the light sensor's signal decreases. Thus a large signal from the light sensor indicates the absence of liquid in the reservoir. This device is designed to detect the presence of water whose index of refraction is 1.33.$

Added by Megan H.

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