Question

angle of incoming solar radiation that will produce highly concentrated rays
autumnal equinox
side the light is on a waxing moon
neap tide
direct rays

Explanation:

Direct rays of solar radiation are the incoming solar rays that are highly concentrated. The autumnal equinox is a time - related astronomical event, the side of a waxing moon is about lunar phases and neap tides are related to the gravitational interaction between the sun, moon and earth.

Answer:

direct rays