Author Question: If the human eyeball is too short from front to back, this gives rise to a vision defect that can be ... (Read 46 times)

TFauchery · **on:** Jul 27, 2018

If the human eyeball is too short from front to back, this gives rise to a vision defect that can be corrected by using

A) convex-convex eyeglasses.
B) concave-convex eyeglasses.
C) cylindrical eyeglasses.
D) contact lenses, but no ordinary lenses.
E) shaded glasses (i.e., something that will cause the iris to dilate more).

Question 2

Which of the following kinds of signal do we currently have the best chance of detecting with currently technology?

A) a signal used for communication between a civilization's home world and another star system
B) a signal used for communication between a civilization's home world and another planet in its own planetary system
C) an intentional signal beacon
D) a signal used for local communication in the world where the intelligent beings exist