Page 202 - text book form physics kssm 2020

From Activity 5.12, you will obtain the refraction of plane water wave. Figure 5.36 shows
the refraction of plane water wave.

Deep water region
λ λ
1 1
Normal
Normal
Direction of
Direction of
propagation of
propagation of λ λ 2 2
Direction of
From deep water region to incident wave i i Direction of
incident wave
propagation of
shallow water region propagation of
refracted wave
r r refracted wave
Shallow water region

Shallow water region
λ λ
2 2

Direction of
Direction of
From shallow water region i i r r propagation of
propagation of
refracted wave
Direction of
to deep water region Direction of refracted wave
propagation of
propagation of
Normal
incident wave
incident wave Normal
λ λ
1 1
Deep water region
Figure 5.36 Refraction of plane water waves
Table 5.3 summarizes the eff ects of refraction on the characteristics of waves.

Table 5.3 Eff ects of refraction on the characteristics of waves

From deep water region to shallow From shallow water region to deep
Characteristic of wave
water region water region
Angle of incidence and Angle of incidence > angle of Angle of incidence < angle of
refraction refraction
angle of refraction
Decreasing Increasing
Wavelength
No change No change
Frequency
Decreasing Increasing
Wave speed
Refracted towards the normal Refracted away from the normal
Direction of
propagation

196
196 5.4.1
5.4.1