Which of the following occurs when light is reflected from a rough or unpolished surface?
a. the original pattern of the light is distorted.
b. the original pattern of the light is preserved.
c. the angle of reflection is less than the angle of incidence.
d. the angle of reflection is greater than the angle of incidence.

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.