Light Flashcards
What does light carry?
Energy.
What does light travel in?
Wavelengths.
Light travels at the speed of…
300,000,km per second.
300,000 km per second.
What describes light?
The electromagnetic spectrum.
What else is in the electromagnetic spectrum?
Radio waves Microwaves Infa red Ultra violet X rays Cosmic rays
The smaller the wavelength, the…
More energy it holds.
Opaque…
…doesn’t let light through.
Translucent…
Lets some light through.
Transparent…
Lets light pass through.
Light from the object…
…ENTERS YOUR EYE.
How do we see objects?
Because they are light objects
Or
Because other lights reflect onto them.
What gives out light?
A luminous object or light source.
What doesn’t give out light?
A non-luminous object eg a book.
What is lateral inversion?
Lateral inversion is where a mirror image of yourself is turned the other way round for example: words become backwards.
What is the angle of incidence?
Angle of the beam of light.
What is the angle of reflection?
The angle of reflected light.
Angle of incidence = …
…angle of reflection.
The distance from behind the mirror…
… To the image is the same distance from the object to the mirror.
How long does light take to get from the sun to the earth?
510 seconds.
Laser beam particles bounce off…
The dust in the air.
What is refraction?
refraction is when light changes direction when it goes through one substance to another.
What are all the colours of the rainbow?
Red orange yellow green blue Indigo Violet
What is white light split into?
Red and Indigo,then all of the other colours of the rainbow.
Which colour is refracted least?
Red.
Which colour is refracted most?
Indigo.
What are the three light primary colours?
Red and blue and green.
Blue and red equals…
Magenta
Blue plus green equal…
Cyan.
Green plus red…
…yellow.
All colours…
White.
