Q. 3

In Fizeau method of measuring the speed of light, the toothed wheel is placed in the focal plane of a converging lens. How would the experiment be affected if the wheel is slightly away from the focal plane?

Answer :

In Fizeau method of measuring the speed of light if the toothed wheel is placed away from the focal length of a converging lens the returning light will fall on an extended surface area of the wheel. In such a case the image will appear even the passage of the light is blocked by one of the teeth of the wheel.


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The speed of light is 299,792,458 ms-1

HC Verma - Concepts of Physics Part 1