What angle of incidence is required for total internal reflection?
a 90° angle
a 180° angle
a small angle
a large angle
A small angle.
Which is a curved piece of glass or other transparent material used to refract light?
a concave lens
an optical fiber
a mirror
a reflector
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a concave lens.
How can signals be sent through optical fibers?
by sending pulses of light
by changing the frequency
by changing the amplitude
by changing the color of light
By sending pulses of light.
What instruments use lenses or mirrors to collect and focus light from distant objects?
lasers
optical fibers
telescopes
microscopes
Telescopes.
Where did the term “laser” come from?
the company that created the first laser: “Lazarus Energy Research”
an early science fiction story
the acronym for “light amplification by stimulated emissions of radiation”
the phrase “light as a strong energy resource”
The acronym for “light amplification by stimulated emissions of radiation”.
Which describes the type of light that a laser produces?
incoherent
many different colors
coherent
many different wavelengths