A system undergoes a reversible cycle that traces a triangle in ...

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A system undergoes a reversible cycle that traces a triangle in the p-V plane.
 
  In the first leg of the cycle, the gas contracts at a constant pressure of 100 kPa from 30 L to 22 L; in the second leg, the pressure increases to 150 kPa, with the volume staying constant. In the third leg, the pressure and volume change so that the system follows the straight line that closes the triangle. How much heat is supplied to the system in each cycle? A) 200 J
  B) 300 J
  C) - 300 J
  D) 400 J
  E) - 400 J

Question 2

In using ray tracing to graphically locate the image of an object that is placed in front of a lens, describe three simple rays that you could draw that pass by the head of the object.
 
  What will be an ideal response?

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Answer to Question 1

A

Answer to Question 2

Ray 1: the vertex ray; i.e., the ray passing through the center of the lens, which emerges undeflected.
Ray 2: the parallel ray; i.e., the incoming ray parallel to the main axis, which is then refracted along a path that extends to the focal point.
Ray 3: the focal ray; i.e., the ray drawn toward the focal point, which is then refracted parallel to the main axis.

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