Thermcol sheet is opaque or not?
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Take a thin thermocol sheet. Cut it in circular discs of different radii like 2cm,3cm,4cm,4.5cm,5cm etc and mark centers with sketch pen. Now take needles of length nearly 6cm. Pin a needle to each disc at its centre vertically. Take water in a large opaque tray and place the disc with 2cm radius in such a way that the needle is inside the water as shown in fig. Now try to view the free end (head) of the needle from surface of the water.
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thermocol is opaque... okay
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