If you cover the penumbra with a black marker, the perception of ...

[plus1]

If you cover the penumbra with a black marker, the perception of the border _____.
 
  A) remains constant
  B) changes from an illumination edge to a reflectance edge
  C) changes from a reflectance edge to an illumination edge
  D) can be predicted from the ratio principle

Question 2

When coming up with a research idea, one should always
 
  a. be aware of existing research.
  b. rely on one's intuition.
  c. be certain that the idea addresses real world problems.
  d. focus primarily on conflicting findings.

[anoriega3]

Answer to Question 1

B

Answer to Question 2

a