Yes, sound travels fast and revibrate/resounance in an enclosed room which is empty. One tends to over heard himself/herself when speaking in an empty room. The atmospheric pressure during the cold weather is must time humid and thin making a fast travel of sound possible. Your voice sound travels so fast at the dread of the night due to less activities around and a relatively calm and cold environment.

When the reflection of a light hit a certain medium it definitely refracted around the surface and causing the bend for the light travelling.

Thanks @greenrun. Another refreshing of memory to the then SS class physics.