Which statement explains why astigmatism causes objects to appear blurry?
a. too much light filters through the lens.
b. the lens focuses images beyond the retina.
c. the lens has two different focal points.
d. the eye cannot blend colors.

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.