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Bukhovtsev-et-al-Problems-in-Elementary-Physics

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PHYSICAL OPTICS<br />

435<br />

S~-------+--+------~IF----';;;~~-<br />

Fig. 564<br />

or<br />

Upon solv<strong>in</strong>g this equation, we f<strong>in</strong>d that<br />

s<strong>in</strong> p<br />

-1±Y4n l -<br />

2 Y2<br />

l<br />

The solution with the plus sign has a physic<strong>al</strong> mean<strong>in</strong>g. For red. rays<br />

s<strong>in</strong> ~r e!! 0.26. Therefore, PI' S!: 15°6'. For viol<strong>et</strong> rays s<strong>in</strong> Po ee 0.31 and Pv:::=<br />

~ 18°6'. The sought angle is e=~o-p,. ~ 3°.<br />

Fig. 665

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