Friday, 30 November 2012

4.5 Transparent, Translucent and Opaque Materials

1) Depending on whether light can pass through them, materials can be
    classified into 3 groups:
    (a) Transparent materials
    (b) Translucent materials
    (c) Opaque materials
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2) Transparent materials allow the most light to pass through.
    (a) Transparent materials can be made of clear glass or clear
          plastic.
    (b) Objects behind a transparent material can be seen clearly.
    (c) Examples: glass, bottle, transparency sheet, light bulb, thermometer,
         beaker, ice, spectacles.
  

                      Windsreen                                                                   Aquarium
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3) Translucent materials allow only some light to pass through.
    (a) Examples of translucent materials are tracing paper, frosted glass
          and certain types of plastic and thin cloth.
    (b) Objects behind a translucent material cannot be seen clearly and
          appeared blurred.
    (c) Othe examples: coloured glass bottle, window pane, plastic bag,
          plastic container.
                                       Frosted glass                                      Lampshade
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4) Opaque materials do not allow any light to pass through.
    (a) A shadow forms behind an opaque material when a light shines
         on it.
    (b) Objects behind an opaque material cannot be seen at all.
    (c) Wood, rubber, metals, some plastics and cloth are opaque materials.
    (d) Examples: wall, hat, clothes, towel, box, paper, bag, book.

                              Umbrella                                                   Wooden door

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