In the diagram above, which of the angles ( theta _1 ) , ( theta _2 ) , ( theta _3 ) and ( theta _4 ) is the angle of deviation of the ray of light passing through the glass prism XYZ?
-
A.
( theta _3 ) -
B.
( theta _2 ) -
C.
( theta _1 ) -
D.
( theta _4 )