APPARATUS

1.    Spectrometer with collimator and telescope.

2.         3 syringes; one for water, one for liquid A and one for liquid B.

3.         A beaker of water plus two sample tubes containing liquids A and B.

4     3 retort stands with clamps.

5.    12V shielded source of white light.

6.   Black card, plasticine, and black tape.

7.         2 plastic squares with holes to act as stops to be placed over the ends of the telescope, with the use of 2 elastic bands.

8.    Sheets of graph paper.

9.         Three dishes to collect water plus liquids A and B lost from syringes.