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Grade 8 Science Colours

Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

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Page 1: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Grade 8 ScienceColours

Page 2: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

How was light discovered?

In the seventeenth century, Sir Isaac Newton placed a prism so that a thin beam of light could pass through it. When the white light passed through the prism, bands of colour emerged from the other side. This is because different colours will refract at different angles producing a rainbow effect.

Page 3: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Dispersion of White Light

Page 4: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

From Coloured Light back to White Light

Page 6: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

The Colour Spectrum

When white light refracts into different colors, the result is called a spectrum. The colours that form the spectrum are:

- Red- Orange- Yellow- Green- Blue- Indigo- Violet

Page 7: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton
Page 8: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton
Page 9: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton
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Place your finger in between the two blocks. What do you see?

Page 11: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Additive Primary Colours

The three additive primary colours are red, green, and blue

Page 12: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

How to create other colours

Using the three additive colours in proper amounts, you can create the three secondary colours: Yellow, Cyan and Magenta

Page 13: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Subtractive Primary Colours

The three subtractive primary colours are Yellow, Magenta, and Cyan

Page 14: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

How to create other colors

Using the three subtractive colours in proper amounts, you can create the three secondary colours: Red, Green, Blue

Page 15: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

What are the differences and similarities

Page 16: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

How many cells are in our retina?

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Answer

2

Page 18: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

The Rods and Cones

Rods - Rods detect the presence of light

Cones - Cones detect colour

Page 19: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Cones

There are three types of cones in our retinas

The first type of cones respond to light of long wavelengths

The second type of cones respond to light of medium wavelengths

The third type of cones respond to light of short wavelengths

Page 20: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton
Page 21: Grade 8 Sciencekodiaks8.weebly.com/uploads/8/8/3/3/88336772/colors... · 2018-09-05 · Grade 8 Science Colours. How was light discovered? In the seventeenth century, Sir Isaac Newton

Colour Blindness

Although white light contains red, orange, yellow, green, blue, indigo, and violet light, cones in the human eye responds mostly to red, green, blue light.

Cone cells in some people’s eyes are unable to detect certain colours resulting in colour blindness