PLZ ANSWER

A student must create a mode of a lens. The lens must be able to focus light into a small space. Which best describes the type of lens the student should model?

A. The student should model a convex lens because it gathers bands of color together to form white light.

B. The student should model a convex lens because it directs light toward the center of the lens.

C. The student should model a concave lens because it directs light toward the center of the lens.

D. The student should model a concave lens because it gathers bands of color together to form white light.

Smog is the term used to describe the combination of fog and smoke

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.