Making rainbows And Colors Of Light Flashcards
What did Isaac Newton discover about light in 1666?
Newton showed that white light could be split into different colours.
What is the range of colours that can be seen in white light called?
The range of colours is called a spectrum.
How many colours are commonly agreed to be in the spectrum?
Most people now agree that there are seven colours.
What is the order of the seven colours in the spectrum?
The order is red, orange, yellow, green, blue, indigo, violet.
What mnemonic can be used to remember the order of the colours?
You can remember the order using the name ‘ROY G. BIV’.
What does dispersion mean in the context of light?
Dispersion means splitting light into different colours.
What causes dispersion of light?
Dispersion happens because light is refracted.
What shape is a prism that is used to demonstrate dispersion?
A prism is in the shape of a triangle.
Which colour of light is refracted through the largest angle?
Violet light is refracted through the largest angle.
Which colour of light is refracted through the smallest angle?
Red light is refracted through the smallest angle.
What is a rainbow?
A rainbow is formed when drops of water in the air cause dispersion of light and reflect light from inside the drops.
What conditions are necessary to see a rainbow?
- The Sun must be shining to provide bright light.
- There must be rain or small drops of water in the air.
- The Sun must be behind you.
What name is given to white light being split into different colours?
Dispersion
What name describes the piece of equipment used to separate white light in the diagram?
C triangular glass prism
What shows the position of red light on the screen?
The letter indicating red light’s position on the screen.
Which colour of light is refracted through the smallest angle?
The colour that is refracted through the smallest angle.
What word describes the range of colours seen on the screen?
Spectrum
Why are drops of water needed for a rainbow to be seen?
Drops of water refract light to create a rainbow.
How many colours do some people see in a rainbow if they see indigo and violet as the same colour?
They will say they can see 6 colours in the rainbow.
What are the primary colours of light?
The primary colours of light are red, green, and blue.
How do primary colours of light differ from primary colours in paints?
The primary colours of light mix differently from the colours in paint.
What colour is formed by adding red and green light?
Red + green = yellow.
What colour is formed by adding red and blue light?
Red + blue = magenta.
What colour is formed by adding blue and green light?
Blue + green = cyan.
What colour is formed by adding all three primary colours of light?
Red + green + blue = white.
How are colours produced on screens like mobile phones and televisions?
Colours are produced from combinations of the three primary colours of light.
What can be seen when looking closely at a computer monitor or television screen?
You can see the individual sources of red, green, and blue light.
What colors can most screens display?
Most screens can display 256 different colors.
How is the color orange created on a screen?
Orange is made by adding red and green, with the red brighter than the green.
What is the purpose of a filter in chemistry?
Filters are used to remove something from a mixture.
How do colored filters work with light?
Colored filters remove colors from light by only transmitting light of their color and absorbing all others.
What is a common example of colored filters?
Traffic lights use colored filters to display red, yellow, or green.
How do traffic lights use colored filters?
Each traffic light has a colored filter in front of a white lamp, transmitting only the color of the filter.
What happens when white light passes through a red filter?
Only red light is transmitted; the other six colors are absorbed.
What is the process demonstrated by colored filters in traffic lights?
This is an example of subtraction of light, where white light has had six colors subtracted to leave only one color.
What type of lamp is used in the blue stage light?
A white lamp is used in the blue stage light.
What is the purpose of the blue filter in the stage light?
The blue filter is used to produce blue light.
How can photographers create different effects?
Photographers can use coloured filters on a camera.
What happens when white light shines on a green filter?
Only green light will get through; the other colours are absorbed.
What is the result when green light shines on a red filter?
No light will get through because green is absorbed by the red filter.
What can be done with colours of light?
It is possible to subtract colours of light until the end result is zero.
What is a non-luminous object?
A non-luminous object is one that does not emit its own light.
How do we see colors in non-luminous objects?
We see the light reflected from the object.
Why does a flower appear yellow in white light?
The flower reflects only yellow light and absorbs the other six colors in white light.
What does a white object do with colors in white light?
A white object reflects all the colors in white light equally.
What does a black object do with colors in white light?
A black object absorbs all the colors in white light and does not reflect any.
What determines the color appearance of an object?
The color appearance of an object depends on which colors of light it reflects and which it absorbs.
What are the three primary colors of light?
The three primary colors of light are red, green, and blue.
What color is produced when red light and blue light are added together?
Magenta
What color is produced when red light and green light are added together?
Yellow
What color is produced when red, green, and blue lights are added together?
White
What color of light will be seen when a yellow filter is used with a white lamp?
Yellow
What color of light will be seen when an orange filter is used with a white lamp?
Orange
A green ball appears green. What two colors of light could be shining on the green ball?
Green and white
A blue ball appears black. What two colors of light could be shining on the blue ball?
Red and green
A T-shirt looks red. Which of the following could explain this? (Choose three letters)
- A: The T-shirt is red and is seen in white light
- B: The T-shirt is red and is seen in red light
- C: The T-shirt is blue and is seen in green light
- D: The T-shirt is white and is seen in red light
- E: The T-shirt is yellow and is seen in blue light
A, B, and D
Why does a red cube appear black in green light?
Because the red cube absorbs green light and does not reflect any light, making it appear black.
Why does a blue cube appear black in red light?
Because the blue cube absorbs red light and does not reflect any light, making it appear black.
