with good explanation

Q2: Answer the following questions:- A- Which region of the electromagnetic spectrum will travel with the fastest speed? B- Which color of the visible light spectrum has the greatest frequency? C- When light passes from a medium with a high index of refraction value into a medium with a low index of refraction value. it will be bends towards or away from the normal. D- Why we used concave lenses for near-sightedness? E- What phenomena does geometrical optics not take into account? F- In what case is r equal to -r