How high does the atmosphere extend from the earth

approximately 430 miles up from the surface of the planet

The exosphere is the outermost layer of Earth's atmosphere (i.e. the upper limit of the atmosphere). It extends from the exobase, which is located at the top of the thermosphere at an altitude of about 700 km above sea level, to about 10,000 km (6,200 mi; 33,000,000 ft) where it merges into the solar wind.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray