Reflections in the double glazing

 

The first thing we noticed was that beyond the first pair of reflected beads there was a second fainter pair circled in yellow. The first pair must be the reflection from the inner pane and the second pair are reflected from the outer pane. 

Close examination of the nearest bead reflection shows a double row very close together. These will be reflections from the outside and inside surfaces of the single pane.

Looking from outside in, notice the reflection of the metal spacer between the panes.

Then using my finger as a marker, I detected a second reflection. This will be the reflection from the other pane of glass. It will be in this second reflection that I saw the thin-film interference bands last week.