In this way we get two portions of water with different depths. To observe the relation between wave speeds with water depth, we cover half of the bottom of the ripple tank with a thick glass plate. Its speed is reduced when it enters in shallow water. The speed of water waves depends upon the depth of water. Like light, water waves exhibition the phenomenon of refraction. Remember that speed of light is more in air (or vacuum) than in glass or water. The refraction occurs due to the change in speed of light in the other medium. This bending of waves from their incident path is called âRefractionâ. When a ray of light enters from one transparent medium to another transparent medium, it bends away from its path (Fig 12.13). Thus we can say that the law of reflection of water waves is identical to law of reflection of light. According to the measurement
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