Answer:
High intensity sun light suppresses the light inside the room reflecting in a window pane.
Step-by-step explanation:
This can be explained as during daytime, there is comparatively higher transmission of the high intensity sunlight inside the house through the window pane than that reflected less intense light from inside the house on the window pane.
This makes the detection of reflection on the window pane more difficult during day time whereas at night these reflection images in a window pane can easily be detected by our eyes due to absence of sun light