# The optical density of turpentine is higher than that of water while its mass density is lower. Fig 9.2.

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The optical density of turpentine is higher than that of water while its mass density is lower. Fig 9.2. shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in Fig 9.2, the path shown is correct?

(a) 1 (b) 2 (c) 3 (d) 4

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(b) 2 incident on turpentine.