Light spreads from colder to warmer air
The temperature of the air above the path is higher, hence the optical density is lower. Light propagates as shown in the diagram. Objects are seen in the direction indicated by the broken line.
Light spreads from colder to warmer air
The temperature of the air above the path is higher, hence the optical density is lower. Light propagates as shown in the diagram. Objects are seen in the direction indicated by the broken line.