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Page 91 - CT&AI_CLasa_7_Part_1
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    9.  Priya is standing in front of a large mirror and    10.  You are in a room that is completely black (no
                         combing her hair with her right hand. As she         windows, no lights). You hold a high-quality
                         looks  in the  mirror, she  notices  something       plane mirror 10 cm in front of your face. Will
                         strange.  Which hand is  the  image  using  to       you be able to see your reflection?
                         comb the hair?         (Pattern recognition)                                 (Abstract Thinking)
                                                                                    (a)   Yes, because mirrors always show
                                (a)   The  image  is  also  using  its  right          a reflection regardless of light.
                                   hand, same as Priya.
                                                                                    (b)   Yes,  because  your eyes  will
                                (b)   The image appears to be using its                eventually  adjust  to  the  dark and
                                   left hand due to lateral inversion.                 see the mirror.

                                (c)   The image  appears  upside  down              (c)   No, because there is no light source
                                                                                       to  reflect off  your face onto the
                                   instead of flipped sideways.
                                                                                       mirror.
                                (d)   The image does not use any hand               (d)   No, because  mirrors only  work
                                   because it is only a reflection.                    when the Sun is out.

                                       During the day, you can see clearly through a glass window into the garden.
                                       However, at night, when the room lights are on, the window acts like a mirror,
                                       and you can see your own reflection instead of the garden. Why?

                                             (a)  The glass changes from transparent to opaque at night.

                                             (b)  The cold night air turns the glass into a mirror.

                                             (c)   The light inside the room is brighter than outside, making the reflection
                                                 from the glass visible.

                                             (d)  Your eyes become stronger in the dark.

                                                                                     Light: Shadows and Reflections   89

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