Question

why do the vertical rays of the sun provide more heat than the slanting rays

Answer 1

Because slanted rays become what's known as indirect sunlight, hitting a much larger area and thus becoming less effective. however sun that is overhead is much more focused and hits a much smaller area making all things in it hotter than indirect sunlight due to the higher concentration yet smaller area of effect. I have added a diagram because my explaining is not the best!

Answer 2

Answer:

Vertical rays give more heat than slanting rays. this is because the vertical rays a direct and concentrated in a smaller area while the slanting rays are spread out over a larger area. Also the vertical pass through a shorter distance of the atmosphere than the slanting rays. Thus, they loss less heat.