![]() When the aperture is larger than the wavelength most waves pass through and little diffraction occurs and when the aperture is much smaller than the wavelength most waves are blocked. The size of the aperture (or object) determines the extent of diffraction, with the most significant diffraction occurring when the aperture is of the same order of magnitude as the wavelength of the wave. Diffractionĭiffraction is the spreading out of a wave when it passes through an aperture (gap/hole) or around an object. She particularly loves creating fun and absorbing materials to help students achieve their exam potential. so moved to Bristol to complete a PGCE in Secondary Science. IMPORTANT NOTE: If a wave enters a medium at 90º to the surface (parallel to the normal) it is not refracted. 3.4.1 Sound Waves 3.4.2 Measuring the Speed of Sound 3.4.3 Effects of Sound Waves. Sound bounces off the surface of the medium which can be a solid or a liquid. The angle of refraction is greater than the angle of incidence Just like the reflection of light, the reflection of sound is similar as it follows the laws of reflections, where the angle of reflection is equal to the angle of incidence and the reflected sound, the incident sound, and the normal sound belong in the same plane.The angle of refraction is less than the angle of incidence.A light ray speeds up as it passes from glass. Absorption happens when a material, such as trees or rocks, soaks up. Refraction can cause optical illusions as the light waves appear to come from a different position to their actual source. Reflection occurs when light bounces off a surface, like a lake reflecting mountains. Refraction changes lights direction when it moves between mediums. The angle of refraction is larger or smaller than the angle of incidence depending on how the speed changes: Light interacts with different media in various ways, including refraction, reflection, and absorption. ![]() Refraction occurs because waves travel at different speeds in different mediums and this change in speed is caused by differences in density between the mediums.
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