{"type":"multi-choice","id":"73614","dataJson":{"key":1,"prompt":"The angle of the mirrors in a periscope is 75º.","options":[{"key":"0.26467408961967775","label":"True","value":"True"},{"key":"0.631228365973773","label":"False","value":"False"}],"limitChoices":{"max":1,"min":1},"validResponse":["False"]}}

{"type":"fill-in-blanks","id":"73615","dataJson":{"key":3,"prompt":"Fill out the blanks","options":{"fast":[{"label":"fast","value":"fast"},{"label":"slowly","value":"slowly"}],"light":[{"label":"light","value":"light"},{"label":"sunshine","value":"sunshine"}],"periscope":[{"label":"periscope","value":"periscope"},{"label":"telescope","value":"telescope"}],"a different":[{"label":"a different","value":"a different"},{"label":"the same","value":"the same"}]},"template":"A mirror reflects {{light}}. Light travels very {{fast}} in a straight line. Light reflecting off the two mirrors in a {{periscope}} allows people to see in {{a different}} direction to the one in which they are looking. ","validResponse":{"fast":"fast","light":"light","periscope":"periscope","a different":"a different"}}}

{"type":"multi-choice","id":"73616","dataJson":{"key":11,"prompt":"Where are or were periscopes most commonly used? Find 3 answers.","options":[{"key":"0.3764455084731888","label":"In submarines","value":"In submarines"},{"key":"0.09488281690764866","label":"In the trenches of World War 1","value":"In the trenches of World War 1"},{"key":"0.02019638632766463","label":"In tanks","value":"In tanks"},{"key":"0.016129469320771417","label":"In pantomimes","value":"In pantomimes"},{"key":"0.8371526680644653","label":"In churches","value":"In churches"}],"limitChoices":{"max":3,"min":3},"validResponse":["In submarines","In the trenches of World War 1","In tanks"]}}

{"type":"multi-choice","id":"73617","dataJson":{"key":13,"prompt":"Which of these can a periscope do?","options":[{"key":"0.6737896834165086","label":"Look around corners.","value":"Look around corners."},{"key":"0.8618693942732315","label":"Make things look bigger.","value":"Make things look bigger."},{"key":"0.6820284228898216","label":"Make things look smaller.","value":"Make things look smaller."},{"key":"0.21282205351571426","label":"Allow people to see things outside the area they are physically in.","value":"Allow people to see things outside the area they are physically in."}],"limitChoices":{"max":2,"min":2},"validResponse":["Look around corners.","Make things look bigger."]}}

{"type":"multi-choice","id":"73618","dataJson":{"key":15,"prompt":"What type of mirrors are used in a periscope?","options":[{"key":"0.37312488949911005","label":"convex","value":"convex"},{"key":"0.6848274705473545","label":"frosted","value":"frosted"}],"limitChoices":{"max":1,"min":1},"validResponse":["convex"]}}

Answer incorrect

Look at the slide below to work out the answer.