GCSE Physics (AQA)

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Transparency & Translucency

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Waves Electromagnetic waves

Transparency & Translucency

3:42 Colour and Visible Light
Spec 4.6.2.6
Previous Refraction Ray Diagrams Next Diffuse & Specular Reflection
  • An object is transparent if visible light is completely transmitted through it.
  • Visible light is a small part of the electromagnetic spectrum that can be seen by our eyes.
  • We see objects because of the light reflecting off them.
  • An object is transparent if light fully transmits through it without reflecting or being absorbed.
  • Examples of transparent objects:
  • Glass window: Allows light to enter a room, reducing the need for artificial lighting, and lets us see outside without losing heat.
  • Water: Allows light to pass through, reflect off objects like a coin, and exit, enabling us to see submerged objects.
  • Understanding transparency is not necessary, but explaining light behavior at transparent materials is important for exams.
  • Translucent objects allow light to pass through but do not allow clear visibility.
  • Example: Frosted glass refracts light multiple times, preventing clear image formation, useful for illumination without visibility.
  • Opaque objects do not allow visible light to pass through as it is reflected or absorbed.
  • Examples of opaque objects:
  • Brick wall: Absorbs most light, reflects some, preventing visibility and light entry into a house.
  • Mug: Does not allow light to pass through, preventing visibility of contents.
  • For exams, recall definitions of transparent, translucent, and opaque, and identify which term applies to a given object.

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