"Light travels in a straight line" this is known as the rectilinear propagation of light. An image is formed whenever an object comes in the way of light. Since the glass window pane is transparent, light simply passes it and hence no image is formed
Hope it helps
9 4 9
Reflection of light does not take place because light passes through it because it is transparent our image is shown only when the reflection of light takes place .

5 4 5