Light orientation. Tourist tips

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Light orientation. Tourist tips

Tourist tips

The table shows data for visibility orientation certain objects.

night visibility

Light source	Visibility
When viewed from the air
Beacons bright and high	to 75 km
Vertical spotlight beams	60 km
Lighthouses of small luminosity and low height	20 km
Headlights of a car, tractor	10 km
For ground observation
Vertical spotlight beams	to 50 km
Bonfires	8 km
Lightning on the clouds	5 km
Flashing fire or reflections of gun shots	1.5 km
Pocket electric torch	1.5 km
lit cigarette	0.5 km

The speed of light in air is approximately equal to the speed of light in vacuum and is 300 km per second, so it is not difficult to calculate the distance to the object of observation by measuring the time it takes light to travel in the forward and backward directions. Unfortunately, the description of the methodology and technique of such measurements takes up too much space and does not fit into the megabytes allocated for the site.

Because the speed of light is 1000 times the speed of sound, it is usually believed that light propagates instantly, therefore, when you see lightning, count the seconds until the first roll of thunder. From the table, you can approximately determine the distance to the place where the discharge disappeared.

Time	Distance in km.
After 1 sec.	1/3
2 seconds	2/3
3 seconds	1.0
4 sec	1.1/3

Time	Distance in km.
After 1 sec.	1/3
2 seconds	2/3
3 seconds	1.0
4 sec	1.1/3

Author: A.E. Menchukov

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