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# P3.5 Colour **A** Our eyes detect three colours of light: red, green, and blue. Two of these colours of light added together make a secondary colour. All three colours of light added together make white light. Coloured objects subtract light by absorbing certain colours of light, reflecting oth...

# P3.5 Colour **A** Our eyes detect three colours of light: red, green, and blue. Two of these colours of light added together make a secondary colour. All three colours of light added together make white light. Coloured objects subtract light by absorbing certain colours of light, reflecting others. For instance, a blue object appears blue because it reflects blue light, and absorbs other colours. **B** A prism forms a spectrum because light separates into different colours when it passes through the prism. Different colours bend by different amounts. Violet light bends the most, and red light bends the least. This separation of light creates the spectrum of colours. (The text mentions that this is because different colours have different frequencies, but that's not entirely clear in the excerpt). **C** Yellow is made by mixing red and green primary colours. **D** **(a)** A white object illuminated by red light and viewed through a green filter will appear black. The green filter blocks the red light, so no light reaches the eye. **(b)** A green object illuminated by white light and viewed through a green filter will appear green. The green object reflects green light, and the green filter allows only green light to pass through to the eye. **E** A red ball illuminated by yellow light will appear red. Yellow light contains red and green light. The ball absorbs the green light and reflects only the red light, making it appear red.