Diffraction effects often involve small angles, and we usually make the approximation sin θ ≅ tan θ. To see how accurate this approximation is, complete the following table.
θ(deg) | θ (rad) | sin θ | tan θ | sin θ/tan θ |
0.0100° |
|
|
|
|
1.00° |
|
|
|
|
5.00° |
|
|
|
|
10.0° |
|
|
| · |
20.0° |
|
|
|
|
30.0° |
|
|
|
|
40.0° |
|
|
|
|
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