Rays that pass through a lens very close to the lens axis are ...

[shenderson6]

Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration.
 
  This effect helps us to understand why A) we become more farsighted as we grow older.
  B) we become more nearsighted as we grow older.
  C) we can see only in black and white in dim light.
  D) it is easier to read in bright light than in dim light.
  E) a moving object is more readily detected than a stationary one.

Question 2

A 25.0-g string is stretched with a tension of 43.0 N between two fixed points 12.0 m apart. What is the frequency of the second harmonic?
 
  A) 6.00 Hz
  B) 12.0 Hz
  C) 18.0 Hz
  D) 24.0 Hz
  E) 36.0 Hz

[jlaineee]

Answer to Question 1

D

Answer to Question 2

B