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<!-- 9. Construct one optical instrument using mirrors or lenses, such as a periscope, a slide or opaque projector, or a simple telescope. -->
===Periscope===
[[Image:Simpleperiscopes.png|thumb|350px|right|'''Principle of the periscope.'''<br>
'''A''' - Periscope using two plane mirrors.<br>
''' B''' - Periscope using two right–angled prisms.<br>
'''1 - 2''' - Plane mirrors.<br>
'''3 - 4''' - Right–angled prisms.<br>
'''5 - 6''' - Observer eye.<br>
'''7 - 8''' - Periscope tube.<br>
'''H''' - Periscope optical height.<br>
'''Different types of periscopes:'''<br>
Lens periscopes. [http://commons.wikimedia.org/wiki/File:Periscope_1.png]<br>Handheld periscope. [http://commons.wikimedia.org/wiki/File:Handheld_periscope.png]<br> Submarine periscope.[http://commons.wikimedia.org/wiki/File:Attack_periscope.png]]]
A periscope is an instrument for observation from a concealed position. In its simplest form it is a tube in each end of which are mirrors set parallel to each other and at an angle of 45° with a line between them. Periscope Principle of the periscope. A - Periscope using two plane mirrors.
B - Periscope using two right–angled prisms.
1 - 2 - Plane mirrors.
3 - 4 - Right–angled prisms.
5 - 6 - Observer eye.
7 - 8 - Periscope tube.
H - Periscope optical height.
Different types of periscopes: Lens periscopes.
[1] Handheld periscope.
[2] Submarine periscope.
[3] A periscope is an instrument for observation from a concealed position. In its simplest form it is a tube in each end of which are mirrors set parallel to each other and at an angle of 45° with a line between them.
