The image of an object O due to reflection from the surface of a lake

1.	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 α, the angular extent δ of the image will be (A) α/2(B) α (C) 2α (D) 4α
Answer» Correct option (C) 2α Explanation: From geometry when mirros are rorated by angle α, reflected ray are rotated by an angle 2α.

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 α, the angular extent δ of the image will be (A) α/2(B) α (C) 2α (D) 4α

Answer»

Correct option (C) 2α

Explanation:

From geometry when mirros are rorated by angle α, reflected ray are rotated by an angle 2α.

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