When an electromagnetic wave bends around the edges of an opening instead of jus

Question

When an electromagnetic wave bends around the edges of an opening instead of just keeping its original straight path, it is because O O O O O there is a destructive interference for the energy that keeps going straight. every point of the wave at the opening generates smaller amplitude waves that interfere. most of the electromagnetic energy gets reflected back by the opening. every other point of the wave at the opening experiences constructive interference. the index of refraction of the opening differs from that of the preceding medium.

Explanation / Answer

When an electromagnetic wave falls on the edge of an obstacle which is comparable to the wavelength of the electromagnetic wave,the em wave deviates from its original path and if we place a screen at the back side of the obstacle we can see fringes.This phenomena is diffraction.Now according to Huygen's principle every point on the edge of the obstacle acts as a secondary source.Since these secondary source generates from one single wave they are monochromatic taking into account that the source is monochromatic and the wave from seceodary souce produces interference pattern on the screen.

Hence correct answer is

Every point of the wave at the opening generates smaller amplitude waves that interfere.

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