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From the Centre for Science Education, and with support from Shell Education services, these materials help children to investigate light and reflection. A periscope is a simple device that enables children to see over walls or round corners. Rays of light hitting the mirror of the periscope are reflected twice. The beam of light is reflected through 90[sup]o[/sup], because the mirrors are at 45[sup]o[/sup] to the path of the light ray. Card mirrors are used to make the periscope as they are cheap and can be cut with scissors. This activity provides a template to construct the shape of the periscope out of thin card. Teacher guidance gives information on the materials required, scientific context and an outline of the activity.

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