A imagem mostra um lápis parcialmente submerso. O raio de luz vermelho proveniente da ponta submersa do lápis sofre refração ao mudar de meio de propagação (da água para o ar). Isso muda a direção do raio luminoso que atinge o olho do observador.
Paula, Helder de Figueiredo e
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Positron Emission Tomography Identification of Cardiovascular Implantable Electronic Device Infection. [PDF]
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