Fill a fish tank with 3-litres of water. Add 250-gm sugar. DO NOT stir it. The sugar will automatically dissolve. A laser beam will go straight at the top but will bend at the lower level because of the density gradient. The sugar solution has low density on top, higher below.
http://www.arvindguptatoys.com/toys/Addsugarbendlight.html This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enablin
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