The group is now travelling together at a different angle. … If one of your friends gets to the tape line first, they have to make a turn and the others follow closely behind in the same direction (notice the last person has to walk fast to catch up?). … If you all reach the tape line at the same time, no-one has to turn and you all keep walking in a straight line … Whoever reaches the tape line first has to make a turn – March together at the same pace towards the tape on the ground – Someone gives you a broomstick for you all to hold together – Stand shoulder to shoulder with three friends A way to think about this is to try a quick activity with your friends This is all about the angle at which the light is travelling when it reaches the edge of another medium (eg, moving from water into air).
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