Social Science Physics Paper 1, MAy/June. 2010   Questions: 1 2
3 4 5 6 Main General Comments                  Alternative b
Question 5  (a)  Diagram  You are provided with a rectangular
glass prism, drawing board, drawing papers, four optical pins
and other necessary apparatus.    Using the diagram above as a
guide, carry out the following instructions.  (i) Trace the
outline ABCD of the glass block on a sheet of paper attached to
the drawing board. (ii)Remove the block and mark a position 0
such that AO is about one quarter of AB.  (iii) Draw the normal
ROL and the incident ray such that I = 20°. (iv)Fix two pins at
points PI and P2 on the incident ray. (v) Replace the block and
fix two other pins at points P3 and P4 such that the pins appear
to be in a straight line with the images ofthe pins appear to be
in a straight line with the images of the pins at PI and P2 when
viewed through the block from the side DC of the (vi) Remove the
block and join the points P 4 and P3 producing the line to meet
DC at M. (