Question
While performing the experiment on tracing the path of a ray of light through a rectangular glass slab, in which of the following experimental set-ups is a student likely to get best results?

P1 and P2 are the positions of pins fixed by him.
-
I
-
II
-
III
-
IV
I
II
III
IV
Solution
C.
III
The student will get best results when the pins are placed as in figure III.