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Question
The optical density of turpentine is higher than that of water while its mass density is lower. In the given figure it shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in the path shown is correct?
The optical density of turpentine is higher than that of water while its mass density is lower. In the given figure it shows a layer of turpentine floating over water in a container. For which one of the four rays incident on turpentine in the path shown is correct?
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Solution
The correct option is C 2
As we know, as the air is optically rarer than turpentine, therefore a ray coming from air should bend towards the normal at the turpentine-air interface.
As the figure indicates from ray 4 and ray 3 , ray 3 goes undeflected and ray 4 bends away from the normal. Secondly, as turpentine is optically denser than water, rays coming from the denser to rarer, will bend away from the normal. As the figure indicates at the turpentine-water interface for ray 1 and ray 2. Only ray 2 out of the two rays bends away from the normal.
Final Answer: (𝑏)
As we know, as the air is optically rarer than turpentine, therefore a ray coming from air should bend towards the normal at the turpentine-air interface.
As the figure indicates from ray 4 and ray 3 , ray 3 goes undeflected and ray 4 bends away from the normal. Secondly, as turpentine is optically denser than water, rays coming from the denser to rarer, will bend away from the normal. As the figure indicates at the turpentine-water interface for ray 1 and ray 2. Only ray 2 out of the two rays bends away from the normal.
Final Answer: (𝑏)
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