I was shining a laser beam through a liquid filled test tube(an ester particularly),and I found this phenomenon rather intriguing.Have a look.
Now when I passed the laser straight through the upper part of the test tube, a scattered blob of laser light appeared in front.
But when I put the laser in front of the liquid filled portion, a straight pattern of light( A laser bar if you may) appeared through on the other side.
Now, what is happening here?From what I know about scattering, an intervening medium tends to scatter more light.
- Why is more light being focused in the second experiment rather than the first which has seemingly lesser optical obstruction?
- Why the horizontal bar of laser light? Why is it not vertical?
- If one looks closely enough one can notice a variation in intensity reaching the other end in experiment 2.How is this happening(assuming that this is interference) if there is just one source?
If it is necessary, the test tube was made of borosilicate glass(3 mm thick) and of diameter around 1cm. A ray diagram for the above situation would be most informative. Sorry for the bad picture.Thanks in Advance!!