By how much do the critical angles for red (660 nm) and blue (470 nm) light differ in crown glass surrounded by air

concave lenses are used here. they spread the light out before it reaches the convex lens in the eye, therefore letting the image focus directly on the retina. hyperopia is known to you probably as farsightedness.

c) up

hope this

i think the answer is a, hope this : )

root word, prefixes, and suffixes