When blue and green light overlap,what color does that region appear?

Explain the structure and functioning of the human eye. How are we able to see nearby as well as distant objects?

Which part of the eye is responsible for adjusting the size of the pupil?

With the help of scattering of light,explain the reason for the difference in colours of the Sun as it appears during sunrise/sunset and noon.

$(a)$ Explain how a normal human eye is able to see distinctly objects placed at a distance as well as those placed at a nearer distance.
$(b)$ What are the far point and near point of a normal human eye?

Mention the factor on which scattering of light depends. Why does the sky appear dark in space?