Light is bent as it passes from the air into the lens of eyeglasses. this bending is called
a reflection
b refraction
c interference
d shifting

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; utilitarian;