Colour and Colour Filters - GCSE Physics

This video introduces colour. There are three primary colours: red, green and blue. This is different to art where the three primary colours are red, yellow and blue. Red and green combine to make yellow, red and blue make magenta and green and blue make cyan. All three colours combined make white light.

Colour filters work by only letting certain frequencies of light through. A coloured filter will only transmit light through with wavelengths that correspond to the same colour as it. The filters absorb every other colour. Therefore colours viewed through a filter of a different colour will appear black and white will appear the same colour as the filter. Two filters of different colours put one before the other will block all incident light.

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy) (Physics only)
Edexcel (Physics only)
OCR A (Physics only)
OCR B (Physics only)

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[jonc.]

That was a clever transition to end card I can't lie.

[atandasodiq]

This is surely going to help me for my phisics test tomorrow

[I.PostMovies]

Thank you very much, that is the explanation I needed for my final

[zahiddogan]

But what makes red filter to be able to stop green and blue lights? Is it something about atomic scale or nanoscale property of filter materials? Wavelength of visible colours hundreds nanometers

[atayafikri]

My teacher send me the link of this video to open and learn about it😎

[hafsahsiddiquah]

3:48 How did you draw a perfect line?? Great video btw!

[Ultrabhaiz]

Nothing just the concept of dry cell into a very transparent way🇮🇳

[muhammadabrar]

By far the clearest explanation i found.. the way you explained helped in understanding the topic most, at least for me..
what i am actually looking for is the way to turn red light into white or some other color through filter if that's actually possible..
The question in my mind now is that, what happens if you use Secondary color filters in front of RGB.. But I think it's easily derivable now though a practical viewpoint would clear things out way farther.. thanks

[cesarpereyra]

Amazing video!

Where did you purchase that?

[shahimqatarneh]

Thank you very much for this fantastic explanation

[nivedhasrinivasan]

Will the wavelength changes with the filter color?

[thomasblack]

Thank you. This gave me the explanation I was looking for.

[myaestheticlife]

so like red filter lets only red light through and blue filter lets blue light through and green filter lets green light through right?

I bought a cheap led light drl strip for the car.But the annoying fact is that it has a greenish tint due to the cob leds are emitting blueish light I think and then the light passes a layer of yellow phosphor-but the end result is a deviance from the 4500K drl.Is there a color filter which can sort out the green component and leave a pure white 4500-600K pass through?

[banajadandasena]

But how that filter works? How it blocks all colour?

[randomuser]

Nice video really like the explanation
definetly gonna help me pass my assessment
really appreciate it

[Verradonairun]

Can I use filters like these to determine the color composition of a mixture of different pigments, such as a mix of different colored paints?

[sandraachieng]

hello what material are the optical filters used?

[Narsuitus]

If you pass sunlight through a prism, the light is split into all the colors of the rainbow.

If you pass through a prism, white light that was created by combined red, green, and blue light, would the white light split into all the colors of the rainbow or just RBG?

[playerful]

Hi interesting. I was wondering what material are the green, red, blue light filters made of or do you have a link where i can buy them?

Love from Australia.