The image of an object O due to reflecti...

The image of an object `O` due to reflection from the surface of a lake is elongated due to the ripples on the water surface caused by a light breeze. This is because the ripples act as tilted mirrors as shown. Consider the case where `O` and the observer E are at the same height above the surface of the lake. If the maximum angle that the ripples make with the horizontal is a, the angular extent `delta` of the image will be

`alpha/2`

`alpha`

`2alpha`

`4alpha`

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