The figure shows wave fronts in still water m | vedclass

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(D) When a wave travels from a shallow region to a deep region,its speed increases. According to Snell's law,the wave bends away from the normal as it

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$IV$

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(D) When a wave travels from a shallow region to a deep region,its speed increases. According to Snell's law,the wave bends away from the normal as it enters the denser (deeper) medium. Since the wave fronts are always perpendicular to the direction of wave propagation (the ray),the refracted wave fronts will bend away from the normal. Looking at the geometry,line $IV$ represents the wave front that has bent away from the normal relative to the incident direction.

The figure shows wave fronts in still water moving in the direction of the arrow towards the interface $PQ$ between a shallow region and a deep (denser) region. Which of the lines shown may represent one of the wave fronts in the deep region?

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