What is refracting telescope
has 2 convex lenses when the lens gets to big it bends under its own weight and causes the image to distort
what is concave mirror
mirror that curves inward toward the object light reflected from the mirror meets at the focal point
what is convex mirror
a mirror that is curved away from the object the rays leaving the mirror are called diverging rays
what is nearsightedness
a person who can see near sighted objects clearly
what is farsightedness
a person who can see farsighted objects clearly