| 1. | Crucial to understanding limb darkening is the idea of optical depth.
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| 2. | The optical depth of the smoke can be much greater than unity.
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| 3. | Its optical depth varies from 0.4 to 0.9.
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| 4. | The optical depth of the atmosphere can be measured with a sun photometer.
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| 5. | The radius at optical depth 2 / 3 is.
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| 6. | Optical depth can therefore be thought of as the opacity of a medium.
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| 7. | The use of the term " optical density " for optical depth is discouraged.
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| 8. | The 830 nm LED is for optical depth.
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| 9. | Where we call \ delta _ d the differential optical depth ( DOD ).
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| 10. | Thus photolithography engineers take extreme measures to maximize the optical depth of field of the photolithography equipment.
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