Diffractionĭiffraction occurs when a wave encounters an object and subsequently bends around the object. The light enabling your sight is refracted by the water, which causes your eyes to see a distorted image (of the pen, pencil, or whatever object is submerged). Observers will note that the object (e.g., a pen or pencil) will look bent. One important rule of reaction that can be observed in this example is that the angle of incidence (Theta 1) is always greater than the angle of refraction (Theta 2).Ī common experiment to help kids and adults alike to understand refraction is to submerge an object in a bowl of water. SPM Physics Form 4/Form 5 Revision Notes Blogger Templates / CC BY-SA Unlike reflection, refracted waves continue traveling through the medium they hit. Refraction is the change in direction of a wave (ray) passing from medium to another. Youtube Video showing incident rays and reflected rays: Reflected Ray – the wave/traveling away from the “hit” surface, and now traveling towards the original medium.Angle of Reflection – the angle at which the reflected wave returns towards the original medium.Equal (or Normal) – divides the two rays (incident / reflected) into two equal angles.Angle of Incidence – the angle at which the traveling wave/ray hits a surface.Incident Ray – the wave/ray traveling towards a surface.NCS Pearson / CC BYįrom the image, you can see that reflection is described by a few key terms: Sound waves, light waves, and water waves can all be reflected. In other words, the waves are sent back towards the source. Reflection is the change in direction of a wave between two different objects such that the wave returns to the medium from which it began. Learning Target #7 will be discussed in class.Waves can change directions in three different ways: reflection, refraction, and diffraction. LT #6: How do We See Color? (Rods and Cones in the Eyes) LTs #1 and #3: Sound Diffraction and Interference LT #5: Echolocation: Blind Man Uses Bat-Like "Vision" LT #5: What Does an Echo Look Like in Echolocation? LTs #1, #2, #3 and #5: Reflection of Sound and Echo LTs #1, #2, and #4: Sound Wave Behaviors: Reflection, Absorption, and Transmission LTs #1 and #2: Differences between Reflection, Refraction, and Diffraction of LIGHT LT#4: How Light Travels LT#4: How Light Travels: Opaque, Transparent, and Transluscent Objects LT #4: How Sound Travels Through Different Media LT #4: How does Sound Travel? I can develop and use a model to compare and contrast how light and sound waves interact with matter.I can illustrate and explain how color is seen.I can illustrate and describe what happens when a sound echoes.I can explain how light and sound travel through various materials.I can describe the reflection, refraction, absorption, and diffraction of light and sound waves.I can explain the difference between light and sound waves.I can define reflected, refracted, absorbed, diffracted and transmitted.LEARNING TARGETS: ( Clarification statement: Includes echo and how color is seen, but does not cover interference and scattering) STANDARD: S8P4 Obtain, evaluate, and communicate information to support the claim that electromagnetic (light) waves behave differently than mechanical (sound) waves.ĮLEMENT: S8P4.d Develop and use a model to compare and contrast how light and sound waves are reflected, refracted, absorbed, diffracted or transmitted through various materials. Updated : Johns Unit 4: Characteristics of Waves S8P5.a- Fields Exist Between Objects (Gravitational, Magnetic, Electrical).S8P4.g- Lenses and Possible Technological Applications.S8P4.f- Use a Model to Predict and Describe the Relationships Between Wave Properties and Energy.
S8P1.e- Structures of Atoms & Molecules AND Patterns in the Periodic Table.S8P1.c- Physical and Chemical Properties.
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