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MODUL • Fizik TINGKATAN 5

Pantulan Gelombang
1.2 Reflection of Waves

Pantulan Gelombang / Reflection of Waves
• Berlaku apabila gelombang tuju terkena pemantul dan mengubah arah perambatannya.
Occurs when an incident wave strikes a reflector and undergoes a change in direction of propagation.
• Berlaku kepada gelombang air, gelombang bunyi, gelombang cahaya dan gelombang elektromagnet.
Occurs to water waves, sound waves, light waves, and electromagnetic waves.

UNIT 1
Gelombang tuju
Gelombang tuju Incident wave
Incident wave
λ
λ λ
i r
Gelombang tuju Gelombang Pemantul satah Plane reflector Pemantul cekung Concave reflector
Incident wave terpantul
Reflected
Pemantul satah wave λ λ λ
Plane reflector Gelombang terpantul Gelombang terpantul
Normal Reflected wave Reflected wave
Normal

i = sudut tuju
(sudut di antara gelombang tuju dan normal) Ciri-ciri / Characteristics
angle of incidence
(the angle between the direction of propagation of the • Sudut i = Sudut r
incident wave and the normal) Angle of i = Angle of r
r = sudut pantulan Panjang gelombang frekuensi halaju
(sudut di antara gelombang pantulan dan normal) • , dan
angle of reflection tidak berubah selepas pantulan.
(the angle between the direction of propagation of the Wavelength frequency speed
reflected wave and the normal) , and do not change after
reflection.
Gelombang tuju
Incident wave • Arah perambatan gelombang berubah apabila ia dipantulkan.
Gelombang terpantul Direction of propagation of wave changes when it is reflected.
Reflected wave

Hukum pantulan / Laws of reflection

• i = r
• Gelombang tuju, gelombang terpantul dan garis normal terletak pada satah yang sama pada sudut tegak dengan permukaan
pantulan pada titik tuju.
The incident wave, reflected wave and normal lie in the same plane which is perpendicular to the reflecting surface at the point of
incidence.

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