The point at which a lens concentrates the light rays which pass through it is the ___________
Glass prisms produce spectra by___________
Light is considered to be________________
Which electromagnetic wave carries the most energy?
Which is translucent?
Convex lenses can produce__________
Which material has the greatest optical density?
A lens that is thinner at the center than at the edge is described as______
Optical telescopes detect_____
This instrument produces symmetrical patterns by repeating the reflections of objects in a pair of mirrors. Name this device that consists of a tube with a glass box of colored bits of glass at one end and a peep hole at the other.