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Physics problems example with solution - Optics - problem 4

Where will touch a stick the bottom of the aquarium if the height of water layer is H = 40 cm and the stick is introduced by a student at an angle of 30° from the surface water in order to achieve a little stone (n = 4/3) ?

















Solution

When the student wants to hit a little stone in point O on the bottom of the aquarium with a stick, he insert the stick under the angle he sees the stone, then finds that the stick touches the bottom of the aquarium in a different point, as it introduces the stick in the direction of light rays that he sees, he ignores the reflection in the water as it changed its direction of propagation.



















In our case i = 60°, so we get AO = 35 cm.

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