71. What is the name of the process where light is used to transfer information through optical fibers?
a) Optical communication
b) Fiber communication
c) Laser communication
d) Lightwave communication
Answer: a) Optical communication
72. What is the name of the type of lens that is flat on one side and curved on the other side?
a) Convex lens
b) Concave lens
c) Plano-convex lens
d) Plano-concave lens
Answer: c) Plano-convex lens
