Question

what is atmospheric refeaction​

Answer 1

here is your answer

⬇️⬇️⬇️⬇️⬇️⬇️⬇️⬇️⬇️

Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. 

Answer 2

Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. ... Astronomical or celestial refraction causes astronomical objects to appear higher above the horizon than they actually are.