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Explain the reflection of waves from rare and denser media

Reflection of Waves

The bouncing hack of waveform the boundary of a medium is calleded reflection of the wave.

When a wave produced in one medium ‘travel to the boundary to enter into another medium, then a part of the incident wave is reflected from the boundary. This reflectc$part has the same frequency and wavelength as the incident wave has. But there may be a change. Of phase which depends uporu the nature of boundary of the medium.

Explain the reflection of waves from rare and denser media

Reflection of waves from the boundary of the denser medium:

Let us take a long slinky spring whose one end is fixed to rigid support on a horizontal surface of a table, The other end of this spring is free to oscillate. A sharp jerk is given to which a crest or through is produced on it. It travels on the spring from its end A towards the end d. On reaching at end B spring exerts a force On the rigid support to produce similar motion in it. But the rigid body has high-density sc it exertS equal and opposite reaction on the spring. Due to which crest is converted into ‘rough and it travels back from end B to A.

Reflection Of Waves from the boundary of a rare medium

If We attach end B of long slinky spring With a light string and keep its end A free, like before, Then giving a sudden jerk to end A, a crest is produced which travels on the spring from its end A to end B. When the crest produced reaches the ‘boundary of string. Then string being tare medium, do not give reaction to the spring. So that a crest is reflected as a crest on the spring from end to end Its: If a transverse wave traveling in a rarer medium is incident on a denser medium, it is reflected such that •it undergoes a phase change Of 1809.

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