Convex/conclave curvature seen with the naked eye can be seen depending on your perspective and on whether or not there is water vapor in the air bending the light. It can curve upwards or downwards. Look through a magnifying glass at different angles to understand this.
Convex/conclave curvature seen with the naked eye can be seen depending on your perspective and on whether or not there is water vapor in the air bending the light. It can curve upwards or downwards. Look through a magnifying glass at different angles to understand this.