Topic 3.1: Colour Flashcards
What is white light?
A mixture of all the colours of light which have different wavelengths
Explain Opaque objects and how their colour is determined
- Opaque objects do not transmit light
- The absorb some wavelengths of light and reflect others
e.g. a red apple is red because the wavelengths corresponding to the red part of the visible spectrum are reflected
How are objects white?
they reflect all wavelengths of visible light equally
How are objects black?
They absorb all wavelengths of visible light - black is the absence of colour/visible light
Explain the colour of translucent and transparent objects
- They transmit light
- Some wavelengths of light may be reflected or absorbed, these objects will appear to be the colour of light corresponding to the wavelengths most strongly transmitted
What do colour filters do?
Filter out different wavelengths of light, so only certain colours/wavelengths can be transmitted - the rest are absorbed
Explain what happens when looking at a blue object through blue and red colour filters
- Through a blue colour filter, the blue object would still look blue as blue light is reflected by the object and transmitted by the filter
- Through a red colour filter, the blue object would look black as the light reflected by the object would be absorbed by the filter
Order the colours of light from longest wavelength and lowest frequency to shortest wavelength and highest frequency
ROY G BIV
What’s a primary colour filter?
A filter that only transmits the colour of the filter
What would happen if white light was shone at a green colour filter?
Green light would be let through only. All other colours would be absorbed by the filter.
Why does a cucumber look green?
- reflects green light
- absorbs all other wavelengths of light
