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DProvided 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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MissPhiladelphia

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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