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53. (a) Approximating
n
= 1 for air, we have
11
5
5
sin
(1)sin
56.9
n
θ
θθ
=
⇒°
=
and with the more accurate value for
n
air
in Table 331, we obtain 56.8°.
(b) Eq. 3344 leads to
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 Spring '08
 Any
 Physics

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