Open another Detector Viewer by clicking Analysis>Detectors>Detector Viewer and make the settings as follows.

Now, we are ready to trace analysis rays to the detector again. Since the N-BK7 lens is uncoated, we need to account for the reflection losses (Fresnel reflection), thus need to enable “Use Polarization” option in the Detector Control window. (Note that we are not splitting rays at this time, and so the reflection losses are accounted for, but the reflected energy is not being propagated. Clicking "Split Rays" will create child rays that take the reflected energy away.)

The total power, reported in the Detector Viewer is now accounting for reflection losses and bulk absorption in the lens.