KS3 Light, Optics and Sound

This section includes ideas from both Y7 and Y8 on all three topics. Make sure you pick the correct section that you are studying…

Light Y7/8 Key Terms

ReflectionWhen light bounces off surfaces. (On a mirror the angle it shines on the mirror and the angle it reflects are the same.)
RefractionWhen light bends when it goes into a different material e.g. glass, water, air.
DispersionWhen white light separates into colours of the spectrum.
SpectrumAll the different colours. R, O, Y, G, B, I, V Three primary: green, red, blue. Secondary: green + red = yellow  OR green + blue = cyan OR red + blue = magenta
MirrorA shiny surface which reflects light.
Triangular PrismThis makes light refract inside the prims and disperse in the air into a spectrum of colours
Virtual ImageNot real – i.e your face that appears inside a mirror behind the wall
VacuumLight does not need a medium to travel through
TransparentLight can pass through a transparent sheet of glass
OpaqueLight cannot travel through a wall
Ray diagramA model which uses ruled lines to show the pathway of travel, with arrows, connected up
IncidentLight going towards a surface
ReflectedLight going away from a surface (normally as the same angle it came it at)
NormalLine at 90 degrees to a surface where you measure the angle from
ScatteringA rough surface scatters light in all directions so no image is formed
FiltersAct to filter out all the colours except that one.
TranslucentAllows some light to pass through but not enough to see detailed shapes
Eye StructureCornea, Pupil, Suspensory ligament, retina, focal point, iris, optic nerve, blind spot
EM SpectrumRadio, Micro, IR, ROY-G-BIV, V, X-Ray, Gamma-Ray, (Cosmic)
ConvexLens which is fat in the middle and gives a focal point. Common uses are magnifying glasses
ConcaveLens is skinny in the middle (or like a cave) makes the light spread out or disperse to form virtual images

Y8 Optics / Light

Optics Lessons for Y8 with all resources inside –

Y8 03 Optics Lessons 1 to 5

University of Vienna Simulation (PC version) to look at lenses for the more advanced view) lenses simulation

Reflection and Refraction

This movie shows refraction, reflection, TIR with prisms.



Sound Video Resources…

This first video shows how an oscilloscope works. It clearly shows how the amplitude or height from middle (zero disturbance) of a wave is the loudness. The frequency of a wave is the length show for a whole cycle (or circle/ up & down).

Signal Generator and Oscilloscope

Oscilloscope and Signal Generator showing ideas of frequency and amplitude for Ks3-5 Pupils

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