Part 4 Test the Theory
The results of our experiment seem to suggest that as light rays strike a surface at angles greater (or less) than 90 they are spread out. But does this mean there is more energy being absorbed (greater area) or less energy absorbed (diluted or thinned)?
What do you think?___________________________________________________
To answer this question and test your theory we will conduct another experiment.
We will use the CBL (Calculator-Based Lab) and a light probe to measure the intensity of light at a fixed distance but from different angles.
Step 1 Place a sheet of polar graph paper on the table.
Step 2 Connect the light probe to channel 1 of the CBL and place the probe
along the 270o axis so that the tip of the probe is in the center.
Step 3 Link the CBL to the T!-83 calculator making sure the connections
are tight. and turn on the calculator.
Step 4 Run the program CHEMBIO and follow the prompts.
Step 5 Select SET UP PROBES and indicate; 1 probe, light probe, channel 1
Step 6 Go to DATA COLLECTION and select TRIGGER.
Step 7 Place the flashlight at the 0o mark, turn it on and press TRIGGER
on the CBL. When it reads done press enter on the calculator to select
read more data.
Step 8 Move the flashlight to the 10o mark and repeat Step 7.
Step 9 Continue in this fashion until you have readings at every 10o increment
from 0o to 180o.