2. • Two right angle prisms can be used to form a
periscope, as shown below.
• The light reflected by the prisms .Total internal
reflection occurs at the back face of the
prisms.
3. Periscope is a certain optical instrument that bases on the light
reflection theory.
The most common use is to stay beneath the water in order to
observe the movement above the water.
In trench warfare, the periscope is used for observing the
situation of the enemy.
Naval use
Periscopes allow a submarine, submerged at a shallow depth, to
search for targets and threats in the surrounding sea and air.
When not in use, the periscope is retracted into the hull. A sub
commander in tactical conditions must exercise discretion when
using his periscope, since it creates an observable wake and may
be detectable to radar, giving away the sub's position.
4. Buy two small mirrors, use hard scrip to
make two right angle elbow cylinder. (The
diameter of the cylinder is a litter bigger
than the diameter of mirrors. Then at the
right angle of the paper canister karat a
tilted mouth at 45 degree, put the mirrors
in, and put paper also. Finally put two
canister together, a periscope is succeed.
7. • 2 pieces of plywood 45 cm × 10 cm and 0.9 cm thick
• 2 pieces of plywood at least 37 cm × 10 cm and 0.9 cm thick
• 2 pieces of plywood at least 11.6 cm × 10 cm and 0.9 cm thick
• 2 pieces of wood which are prism shaped at least 10 cm × 8.5
cm × 8.5 cm the internal angles should be 90 °and 45°
• 2 plastic or glass mirrors 10 cm × 10 cm
• small screws to fit.
• Screwdriver
• Drill with suitable drill bits for the screws
• PVA Glue
8. • It’s very useful in our daily life.
• We can use it to see some people you want to
see.
• It’s obey the reflection of light’s rule.
