Page 38 - FOUNDATIONS FOR LIFE; EXPLORING GOD’S UNIVERSE
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TEST ON LIGHT




        1.     Name two sources of light.  Sun, candle, torch, fire, electric lights, etc             (2 marks)


        2.     Label the parts of the human eye.                                                      (8 marks)


                                                                                                           3.
                                            Diagram of the eye





                                                                                           Sclera



                            Cornea
                                                                                             Optic
                                                                                             nerve
             Iris
                          Pupil



















               Complete the sentences by circling the correct words.                           (2 marks)

               a)      Light travels ( faster   /   slower ) than sound.

               b)      Light travels in ( wavy lines   /  straight lines ).

        4.     What is meant by ‘reflection’ when speaking of light? To bend or send back eg when light
               strikes a mirror.
                                                                                (1 mark)

        5a.    Why does a straw appear to bend when it stands in water? Light travels at different
               speeds through different materials. As light slows down it changes direction slightly
               giving the impression that objects, for example in water, are bent.

        5b.    What is this called?  Refraction                                                  (2 marks)

        6.     Name two kinds of lenses.    Convex, concave                                      (2 marks)



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