Light and Colour Flashcards Preview

P5 > Light and Colour > Flashcards

Flashcards in Light and Colour Deck (15):

What is a Prism?

A triangular shaped piece of glass used to produce a spectrum by splitting white light


How do you produce a spectrum of white light?

Each frequency of light travels at a slightly different speed in glass
Each frequency of light is refracted by a different amount


What is the difference in Refraction between higher frequency light and lower frequency light?

Colours with a higher frequency are refracted more than those with a lower frequency


What is Dispersion?

The separation of colours in white light into a continuous spectrum


What does spectral colours mean?

A colour related to a single wavelength in the electromagnetic spectrum


What are the Spectral Colours?

Red, Orange, Yellow, Green, Blue, Indigo, Violet
(Mnemonic: Roy. G. Biv


Which 3 of the spectral frequencies is the retina of your eye sensitive to?

Red, Green, Blue


What is percieved colour?

The colour that we see because of the light that is absorbed by the three types of photo receptors (Red, Green, Blue) on our retina


How is colour related to Transmission and Absorption?

If you put materials infront of a white light source that absorb certain frequencies of light but transmit others


What are examples of filters that affect absorption and transmission?

Red filter absorbs all different frequencies of white light except red, it transmits red
No light goes through a red and green filter togther
If your receptor cells receive the right amount of red, green, blue you see white


How is colour related to reflection?

Reflection from surfaces depends on the type of surface


What are the two types of surface?

Scattered, Specular


What is Specular reflection?

Reflection at a smooth surface, parallel beams still parallel after reflection


What is Scattered reflection?

Reflection from a rough surface, light is scattered in all directions


Why does ink appear black?

Because the particles absorb all the wavelengths