How a periscope works - Mr Blair 5B

How a periscope works What is a periscope? A periscope lets you see over the top of things, such as fences or walls that you aren't tall enough to look over. You can also use it to see around corners. People first started using periscopes in submarines around the 1860s, to allow the sailors to see above the water. Later,

soldiers in the First World War used them to look out of the trenches without having to put their heads out of the trench. Periscopes are still used today in tanks and some submarines. What is a periscope? A simple periscope is just a long tube with a mirror at each end. The mirrors are fitted into each end of the

tube at an angle of exactly 45 degrees (45) so that they face each other. In the periscope, light hits the top mirror at 45 and reflects away at the same angle. The light then bounces down to the bottom mirror. When that reflected light hits the second mirror it is reflected again at 45, right into your eye. You can see this in the picture on the left. Watch this video How a periscope works http://www.youtube.com/watch?v=6MXbTXYI gqw

SCIENCE ASSESMENT TASK (TERM 3) *Making a periscope and writing an explanation how a periscope works (You will not get marks for your periscope but you will be marked on

your EXPLANATION of how it works) How to make a periscope http://www.webinnate.co.uk/science/w eek8.htm http://m.wikihow.com/Make-a-Periscop e Research what materials will you need to make your periscope? Your periscope will be made at home

and brought to class on Sunday of Periscope examples Periscope template Scientific explanation You will now write an explanation about how a periscope works and include a labelled ray diagram. Do you remember the key parts of an explanation text? Introduction (general statement about periscopes)

Explanation sequence (how it works, set by step) Closing statement (a sentence to finish your explanation) Include a labelled ray diagram of your periscope Your science draft is due Wednesday 11th in week 5 and the good copy for marking is due in week 6, Wednesday 18th May. Title- How a periscope works

Opening sentence (introduce topic)A periscope is. A periscope is made from. We use a periscope to. Explanation sequence First the light travels.. Next it reflects.. TRY USING THESE SCIENCE WORDS: Light eyes

Travels Reflect Mirror straight line Light source angle Closing sentence (to finish your explanation)- Now you know how.. In conclusion Game- periscopes http://www.bbc.co.uk/bitesize/ks2/scien

ce/physical_processes/how_we_see_thi ngs/play/

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