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Diffraction is caused by propagation of secondary wavelets into _______

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Diffraction is caused by propagation of secondary wavelets into _______

(a) Bright region

(b) Shadowed region

(c) Smooth region

(d) Large region

This question was addressed to me during an interview.

This intriguing question originated from Diffraction in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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Correct option is (b) Shadowed region

Easiest explanation: Diffraction is caused due to propagation of secondary wavelets into a shadowed region. The field strength in the shadowed region is the vector sum of the electric field components of all the secondary wavelets in the space around the obstacle.

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