Light Terminology - Optics and Vision Test Review

Question 1

Define the following word: Luminous

Answer 1

emitting or reflecting usually stead suffused or glowing light

Question 2

Define the following word: Natural light source

Answer 2

light that occurs naturally without the involvement of humans

Question 3

Define the following word: Biouminescence

Answer 3

the biochemical emission of light by living organisms like firelifes

Question 4

Define the following word: Chemiluminescence

Answer 4

the emission of light as a result of a chemical reaction

Question 5

Define the following word: Phosphorescence

Answer 5

the emission of light from a substance after it has been exposed to radiation such as ultra violet light

Question 6

Define the following word: Electroluminescence

Answer 6

the emission of light as a result of an electric current passing through a material or substance

Question 7

Define the following word: Incandescent Light bulbs

Answer 7

A type of electric light that works by heating a filament until it glows, providing/producing ight - less energy, efficient than any other light bulb

Question 8

Define the following word: A light emitting diodes(LEOs)

Answer 8

a type of energy-efficient lighting that uses a semi conductor to convert electricity into light. More efficient than another florescent light

Question 9

Define the following word: Transparent

Answer 9

a substance or a material that lets light through without scattering or diffusing light

Question 10

Define the following word:Translucent

Answer 10

a substance or a material that lets some light through, scattering or diffusing light

Question 11

Define the following word:Shadow

Answer 11

a dark that created when an opaque object blocks that path of a light source

Question 12

Define the following word: Umbra

Answer 12

the darkest part of a shadow

Question 13

Define the following word: Penumbra

Answer 13

the partially shaded/darken part that surrounds a shadow

Question 14

Define the following word: Compact fluorescent lamps

Answer 14

a type of energy saving light bulb that works by passing an electric current through a type of containing oxygen and a small amount of mercury vapor producing ultra violet light

Question 15

Define the following word: Light

Answer 15

a format electro magnetic radiation that is visible to the human eye. Its produced by the movement of electrons within atoms and molecules, it also travels in waves

Question 16

Define the following word: Ray

Answer 16

a straight line that represents the path of light as it travels through a medium and they are used to describe in light optical systems, such as lens and mirrors

Question 17

Define the following word: Beams

Answer 17

a concentrated stream of particles or energy, such as light or electrons, that is directed in a specific direction