Which of the following is not a primary color of light?

Reddish appearance of the sun at sunrise or sunset is significantly due to

Accommodation means the adjustment of light going into the eye for image formation.

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

Why can you not see an object clearly if it is placed very close to your eye?

$(i)$ Write the range of distance for a person having normal vision.
$(ii)$ $A$ person needs to use glasses for reading a newspaper. Identify the defect in his vision and the type of lens he would need to correct it.
$(iii)$ Sometimes when we enter into a dark room from bright sunlight,we are unable to see objects clearly. Why?