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Overview         (For age - group : Below 16 )

Educational science animation " Bent Pencil" : Why does a pencil dipped in water appear bent. Application of principle of refraction shown from different perspective make the understanding better. This animation gives explanation based on user perspective. This animated physics topic is very useful for teachers and students both.

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Duration (hr:min:sec) 0:1:50
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Principle of refraction works in the case of pencil appearing bent when dipped in water, to understand bent pencil from books is not easy , because, observers point of view is never shown . The animation shows different views to explain the concept clearly.

pencil appears straight in a beaker Pencil appears bent after water is poured
Pencil appears straight in a beaker
Pencil appears bent after water is poured
bent pencil changes from observers point of view
Observers point of view - pencil placed obliquely in beaker
Observers point of view - pencil placed straight in beaker
Details of the animation/ movie /software

A pencil which is partially dipped in water appears bent to the observer. Rays emanating from the portion of the pencil above water reaches the observer's eyes directly. While the light rays emanating from the submerged part of the pencil reach the observer's eyes after being bent at the water-air layer. The combination of the light rays reaching the observer give a look of the bent pencil. The bent pencil even appears fatter.
If you are still unclear about the concepts, please refer the animation below.

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