A converging lens of short focal length can take light diverging from a small source and refract
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A converging lens of short focal length can take light diverging from a small source and refract it into a beam of parallel rays. A Fresnel lens, as shown in Figure 36.29, is used for this purpose in a lighthouse. A concave mirror can take light diverging from a small source and reflect it into a beam of parallel rays. Is it possible to make a Fresnel mirror? Is this an original idea, or has it already been done? Suggestion: Look at the walls and ceiling of an auditorium.
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You have likely seen a Fresnel mirror for sound The diagram represents first a side view of a ...View the full answer
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