12.4 Using Light Section

(a)   is light with a magnetic field that vibrates in only one direction.

_____ is a technique that produces a hologram, a complete three dimensional photographic image of an object.

• Holography

• Linearly Polarized light

• Optical scanner

• Total internal reflection

The complete refection of light at the boundary between two different materials is called _____?

• Holography

• Optical Scanner

• Linearly Polarized light

• Total internal reflection

An (a)   is a device that reads intensities of reflected light and converts the information into digital signals.

What is the method for optical fibers transmitting telephone conversations.

• Sound to electric signal, Electric to light, Light back to Electric, then electric back to sound.

• Sound to light, light to electrical, electrical back to light, light back to Sound

• Light to sound, sound to electrical, electrical back to Sound

• Sound to light, then light back to Sound

Identify all the conditions that are necessary for total internal reflection to occur?

• It Must happen at a boundary between two materials

• Light must travel slower in current material compared to previous

• The angle of incidence must be greater than the critical angle

• It must happen in only one material

An optical fiber has a diameter of 0.3mm. How many fibers would be needed to form a cable with a square cross section, if the cross section was 1.5 cm on a side?

• 250

• 25

• 2,500

• 25,000

What are needed to produce holograms?

• 3D objects

• 2D objects

• Lasers

• UV light