Light and Optics Review

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Grade 8 Light and Optics Review

Science

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46 Terms

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Light

Form of energy

<p>Form of energy</p>
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Natural Light Source

A naturally occurring light source

<p>A naturally occurring light source</p>
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Artificial Light Source

Man-made light

<p>Man-made light</p>
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Absorption

When light is absorbed instead of reflected or transmitted

<p>When light is absorbed instead of reflected or transmitted</p>
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Reflection

The light reflected by a body or surface

<p>The light reflected by a body or surface</p>
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Refraction

Bending of light when it travels from one medium to another medium of a different density

<p>Bending of light when it travels from one medium to another medium of a different density</p>
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Incandescence

Emission of visible light from heat

<p>Emission of visible light from heat</p>
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Fluorescence

Photons are absorbed then emitted as visible light after light source is cut off

<p>Photons are absorbed then emitted as visible light after light source is cut off</p>
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Phosphorescence

Photons are absorb and emitted as visible light immediately

<p>Photons are absorb and emitted as visible light immediately </p>
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Bioluminescence

Chemical reaction of an living organism that produces light

<p>Chemical reaction of an living organism that produces light</p>
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Ray diagram

Depiction of the path light takes

<p>Depiction of the path light takes</p>
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Transparent

Allows light to pass through

<p>Allows light to pass through</p>
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Translucent

Allows SOME light to pass through, others are absorbed

<p>Allows SOME light to pass through, others are absorbed</p>
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Opaque

Does not allow any light through

<p>Does not allow any light through</p>
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Incident Ray

The ray that strikes a reflecting or refracting surface

<p>The ray that strikes a reflecting or refracting surface</p>
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Reflected Ray

The light that is cast back (reflected) from a reflective surface

<p>The light that is cast back (reflected) from a reflective surface</p>
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Normal Line

Perpendicular to the reflecting surface at the point where the incident ray strikes the surface

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Angle of Incidence

the angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence.

<p>the angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence.</p>
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Angle of Reflection

the angle made by a reflected ray with a perpendicular to the reflecting surface.

<p>the angle made by a reflected ray with a perpendicular to the reflecting surface.</p>
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Plane Mirror

Mirror with a flat surface

<p>Mirror with a flat surface</p>
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Law of Reflection

Angle of reflection=Angle of incidence

<p>Angle of reflection=Angle of incidence</p>
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Convex Mirror

An reflecting surface in which its bulging side faces the source of light.

<p>An reflecting surface in which its bulging side faces the source of light.</p>
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Concave Mirror

An reflecting surface in which its bulging side does not face the source of light

<p>An reflecting surface in which its bulging side does not face the source of light</p>
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Virtual Image

<p></p>
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Angle of Refraction

Angle between the normal and the refracted ray

<p>Angle between the normal and the refracted ray</p>
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Concave Lens

Image result for concave lens definition
A concave lens is a lens that possesses at least one surface that curves inwards

<p>Image result for concave lens definition<br>A concave lens is a lens that possesses at least one surface that curves inwards</p>
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Convex

Curving outwards

<p>Curving outwards</p>
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Concave

Curving inwards

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Real image

Appears in front of a mirror, like a movie screen

<p>Appears in front of a mirror, like a movie screen</p>
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Cornea

Transparent lens forming the front of the eye

<p>Transparent lens forming the front of the eye</p>
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Blind spot

small area in your vision where you can’t see anything

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Pupil

Allows light into the eye

<p>Allows light into the eye</p>
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Iris

Controls the size of the pupil

<p>Controls the size of the pupil</p>
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Optic Nerve

Only nerve in the body that is not in the spinal cord
Transports the image to the brain

<p>Only nerve in the body that is not in the spinal cord<br>Transports the image to the brain</p>
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Iris

Muscle surrounding the pupil controlling how much light enters the eye

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Pupil

Opening in the eye to allow light in

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Lens

bends and focus light to create a sharp image

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Retina

Forms the image

<p>Forms the image</p>
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Diaphragm (camera)

Controls the amount of light entering the camera

<p>Controls the amount of light entering the camera</p>
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Shutter (camera)

Opens the aperature to allow light reach the film

<p>Opens the aperature to allow light reach the film</p>
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Myopia

Unable to see far objects clearly (Near-sightedness)

<p>Unable to see far objects clearly (Near-sightedness)</p>
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Hyperopia

Unable to see near objects clearly (Far-sightedness)

<p>Unable to see near objects clearly (Far-sightedness)</p>
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Eyepiece lens (Refracting Telescope)

Works like magnifying glass to enlarge objects

<p>Works like magnifying glass to enlarge objects</p>
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Spectrum

Series of coloured bands, produced when white light separates into its components of wavelengths

<p>Series of coloured bands, produced when white light separates into its components of wavelengths</p>
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Rods

A cylinder like cell that detects the presence of light

<p>A cylinder like cell that detects the presence of light</p>
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Cones

A cone shaped cell at the back of the eye that detects colour

<p>A cone shaped cell at the back of the eye that detects colour</p>