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Reflection

邊玩邊學

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課程筆記

Key Facts about Light

  • Light is a transverse wave.
  • Transverse waves have vibrations perpendicular to the direction of wave travel.
  • Light travels at 300 000 000 m/s (the speed of light).
  • Light is part of the electromagnetic spectrum, which contains seven types of transverse waves.

Specular Reflection

  • Specular reflection occurs when light reflects from a very smooth surface, like a mirror.
  • The incident ray is the ray approaching the surface.
  • The normal is an imaginary line drawn at 90° to the surface.
  • The angle of incidence is the angle between the incident ray and the normal.
  • The reflected ray leaves the surface; its angle with the normal is the angle of reflection.
  • The law of reflection states: angle of incidence = angle of reflection.

Diffuse Reflection

  • Diffuse reflection happens when light reflects from a rough surface.
  • Rays are reflected at many different angles because the surface is uneven.
  • The law of reflection still holds for each individual ray (angle i = angle r).
  • The overall effect is that the reflected light is scattered, not focused.

The Law of Reflection

  • The law of reflection applies to all waves, not just light.
  • It can be stated as: angle of incidence = angle of reflection.
  • Both angles are measured from the normal, not from the surface.

Specular reflection showing incident ray, reflected ray, normal, and equal angles of incidence and reflection.

Reflectionnormalincident40°reflected40°

投影片

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練習題

免費預覽——64 題中的 8 題。註冊即可查看全部。

  1. 1.Which of the following best describes light?

    Easy
    • AA transverse wave
    • BA longitudinal wave
    • CA stationary wave
    • DA mechanical wave

  2. 2.What is the speed of light?

    Easy
    • A300 000 000 m/s
    • B300 000 m/s
    • C3 000 000 m/s
    • D30 000 000 m/s

  3. 3.The law of reflection states that:

    Easy
    • AThe angle of incidence equals the angle of reflection.
    • BThe angle of incidence is greater than the angle of reflection.
    • CThe angle of incidence is less than the angle of reflection.
    • DThe angle of incidence is measured from the mirror surface.

  4. 4.Which type of reflection occurs when light hits a rough surface?

    Easy
    • ADiffuse reflection
    • BSpecular reflection
    • CTotal internal reflection
    • DRegular reflection

  5. 5.In a specular reflection, the reflected rays are:

    Easy
    • AParallel to each other
    • BScattered in many directions
    • CAbsorbed by the surface
    • DRefracted into the surface

  6. 6.What is the normal in a ray diagram?

    Easy
    • AA line drawn at 90° to the mirror
    • BThe incident ray
    • CThe reflected ray
    • DThe mirror surface

  7. 7.Which of the following is true about diffuse reflection?

    Medium
    • AThe angle of incidence is still equal to the angle of reflection for each ray.
    • BThe angle of incidence is not equal to the angle of reflection.
    • CThe law of reflection does not apply.
    • DThe surface is very smooth.

  8. 8.Which of the following waves obey the law of reflection?

    Easy
    • ALight waves only
    • BAll waves
    • COnly transverse waves
    • DOnly electromagnetic waves

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