Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 12-16, 1897

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        <div xml:id="echoid-div59" type="section" level="1" n="56">
          <p>
            <s xml:id="echoid-s2322" xml:space="preserve">
              <pb o="45" file="0177" n="177"/>
            geraden Linie. </s>
            <s xml:id="echoid-s2323" xml:space="preserve">Man nennt dieſe Ablenkung die “Brechung des
              <lb/>
            Lichtſtrahls”, denn wenn man ſich den Weg zeichnet, den ein
              <lb/>
            Lichtſtrahl unter ſolchen Umſtänden nimmt, ſo erhält man eine
              <lb/>
            gebrochene Linie. </s>
            <s xml:id="echoid-s2324" xml:space="preserve">Fig. </s>
            <s xml:id="echoid-s2325" xml:space="preserve">3 zeigt uns, wie der Lichtſtrahl A B
              <lb/>
            durch ein regelmäßig geſchliffenes Glasſtück von ſeinem Wege
              <lb/>
            abgelenkt wird, ſodaß er nicht nach F gelangt, wie es geſchehen
              <lb/>
            würde, wenn das Glasprisma nicht im Wege ſtände; </s>
            <s xml:id="echoid-s2326" xml:space="preserve">vielmehr
              <lb/>
            ſchlägt er nun die Bahn B D ein, um dann, nachdem der
              <lb/>
            Glaskörper durcheilt iſt, parallel zu ſeiner urſprünglichen Rich-
              <lb/>
            tung den Weg D E einzuſchlagen. </s>
            <s xml:id="echoid-s2327" xml:space="preserve">Fig. </s>
            <s xml:id="echoid-s2328" xml:space="preserve">4 veranſchaulicht da-
              <lb/>
              <figure xlink:label="fig-0177-01" xlink:href="fig-0177-01a" number="8">
                <caption xml:id="echoid-caption5" xml:space="preserve">Fig. 4.</caption>
                <variables xml:id="echoid-variables4" xml:space="preserve">A g B h F C i D k E l</variables>
              </figure>
            gegen die Brechung verſchiedener, von den Punkten A, B, C, D, E
              <lb/>
            ausgehender paralleler Strahlen an einer gekrümmten Glas-
              <lb/>
            fläche in den Punkten g, h, i, k, l.</s>
            <s xml:id="echoid-s2329" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s2330" xml:space="preserve">Eine weitere Lehre von der Brechung des Lichtes thut
              <lb/>
            dar, daß jeder Lichtſtrahl, der auf eine Glaslinſe trifft, ſo ge-
              <lb/>
            brochen wird, daß ſich beim Durchgang alle Lichtſtrahlen in
              <lb/>
            Einem Punkte jenſeits der Linſe vereinigen und anſammeln
              <lb/>
            (Punkt F in Fig. </s>
            <s xml:id="echoid-s2331" xml:space="preserve">4). </s>
            <s xml:id="echoid-s2332" xml:space="preserve">Dieſer Punkt wird der Brennpunkt ge-
              <lb/>
            nannt, weil man durch die Vereinigung ſämtlicher Sonnenſtrahlen,
              <lb/>
            die durch ſolche Glaslinſe gehen, imſtande iſt, Wärme zu erzeugen,
              <lb/>
            wie das bekanntlich bei Brenngläſern der Fall iſt. </s>
            <s xml:id="echoid-s2333" xml:space="preserve">Es ergiebt
              <lb/>
            ſich ferner aus weiteren Geſetzen der Brechung des </s>
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    </echo>
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