If the size of the scattering particles is extremely fine, which color of light do they scatter?

$(i)$ What is the least distance of distinct vision for a normal eye?
$(ii)$ Does the above distance increase or decrease for a long-sighted eye (hypermetropia)? Give a reason for your answer with a diagram.

What is the complementary color of green?

What would have been the colour of the earth's sky if there were no atmosphere?

List two causes leading to myopia of the eye. Draw ray diagrams to show the image formation in case of a defective eye and a corrected eye.

What is the function of the choroid?