Light And Sound
Visão Geral
A straw looks broken where it enters a glass of water. A shout comes back off a distant wall a moment after you make it. A single strand of glass thinner than a hair carries a television channel across an ocean. All three are the same two ideas at work: waves bounce, and waves bend.
This lesson takes reflection and refraction from the ray box on the bench to the fibre under the sea. You will learn the law of reflection, investigate refraction through three different shapes of block, meet the critical angle, and see why sound behaves in exactly the same two ways as light.
Objetivos
- Know that light waves can be reflected and refracted
- Use the law of reflection (the angle of incidence equals the angle of reflection)
- Investigate the refraction of light, using rectangular blocks, semi-circular blocks and triangular prisms
- Describe the role of total internal reflection in transmitting information along optical fibres and in prisms
- Explain what is meant by critical angle
- Know that sound waves can be reflected and refracted
Mapa mental
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Nota de Aula
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- The law of reflection states that: A) the angle of incidence is twice the angle of reflection B) the angle of incidence equals the angle of reflection C) the angle of reflection is measured from the surface D) the angle of reflection is always 90 degrees Answer: B
- A ray of light passes from air into glass. It bends: A) away from the normal B) towards the normal C) not at all D) back along its original path Answer: B
- Total internal reflection can occur when light travels: A) from air into glass at any angle B) from glass into air below the critical angle C) from glass into air above the critical angle D) from air into glass above the critical angle Answer: C
- A ray of light strikes a mirror at 20 degrees to the mirror surface. The angle of reflection measured from the normal is: A) 20 degrees B) 40 degrees C) 70 degrees D) 90 degrees Answer: C
- A ray enters a semi-circular block aimed at the centre of the flat face. At the curved surface it: A) bends towards the normal B) bends away from the normal C) does not bend, because it travels along the normal D) is totally internally reflected Answer: C
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Secção do manual
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Explain refraction at media boundaries, predict the path of light after passing through a boundary (Snell’s law), describe the index of refraction of materials, explain total internal reflection, and describe applications of refraction and total internal reflection
"Physics: Refraction" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/16-2-refraction. Access for free at https://openstax.org/books/physics/pages/1-introduction
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Reflection
Explain reflection from mirrors, describe image formation as a consequence of reflection from mirrors, apply ray diagrams to predict and interpret image and object locations, and describe applications of mirrors
"Physics: Reflection" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/16-1-reflection. Access for free at https://openstax.org/books/physics/pages/1-introduction
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