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6 March, 03:51

D) Provided a recording medium (film) with sensitivity of 100uJ/cm2 and a power detector with 10mm of diameter, background measured optical power of 8uW and measured optical power from the laser source of 50uW, determine the exposure time of the recording medium.

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  1. 6 March, 04:05
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    We are given with:

    Sensitivity: 100uJ/cm2

    Diameter: 10mm

    Background Optical Power: 8uW

    Source Optical Power: 50uW

    Required: exposure time

    Solution:

    Exposure time = sensitivity x area / (background power - source power)

    = 100uJ/cm2 (π/4) (1 cm) ² / (80 uW - 50 uW)

    = 2.62 s

    The exposure time is 2.62 seconds.
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