Optics 5: Making Rainbows

Forces and Motion
Lesson 12. 
Dispersion of Light
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Slide 1: Slide
PhysicsSecondary EducationAge 13

This lesson contains 31 slides, with interactive quizzes, text slides and 2 videos.

Items in this lesson

Forces and Motion
Lesson 12. 
Dispersion of Light

Slide 1 - Slide

How are you today?
😒🙁😐🙂😃

Slide 2 - Poll

Highlights of the Day
  • explain that white light is made of many colours and this can be shown through the dispersion of white light using a prism.
  • Values :  Responsibility and Determination

Slide 3 - Slide

Intro Questions

Slide 4 - Slide

Class Discussion
  • Do you ever see a rainbow at night?
  • Does the Sun have to be shining to enable you to see a rainbow?
  • Does there have to be rain or recent rain to enable you to see a rainbow?
  • What colours can you see in a rainbow?

Slide 5 - Slide

Do you ever see a rainbow at night?
YES
NO

Slide 6 - Poll

Does the Sun have to be shining to enable you to see a rainbow?
YES
NO

Slide 7 - Poll

Does there have to be rain or recent rain to enable you to see a rainbow?
YES
NO

Slide 8 - Poll

What colours can you see in a rainbow?

Slide 9 - Open question

Challenge Questions

Slide 10 - Slide

Slide 11 - Slide

Who was the scientist shown earlier?
A
Isaac Newton
B
Albert Einstein
C
Nikola Tesla
D
Bill Gates

Slide 12 - Quiz

In the year _____________ , Newton showed that white light could be split into different colours.
A
1666
B
1777
C
1888
D
1555

Slide 13 - Quiz

Slide 14 - Slide

  • Newton used light from the Sun, coming through a hole. 
  • Newton used a glass block in the shape of a triangle to split the light into its colours. 
  • He shone the colours onto a screen.

Slide 15 - Slide

From which source of light did Newton use in his experiment?
A
Moon
B
Sun
C
light bulb
D
lamp

Slide 16 - Quiz

What shape of glass block was used by Newton in his experiment?
A
spherical
B
rectangular
C
triangular
D
cylindrical

Slide 17 - Quiz

  • The range of colours that can be seen in white light is called a spectrum

Slide 18 - Slide

  • In the spectrum, the colours are not separate but they merge from one to another.

Slide 19 - Slide

What is the name given to the range of colors that can be seen in white light?
A
rainbow
B
spectrum
C
light ray
D
incident ray

Slide 20 - Quiz

In the spectrum, what does the colours of light do to make visible white light back?
A
combine
B
separate
C
reflect
D
refract

Slide 21 - Quiz

Slide 22 - Slide

What acronym will you use to remember the 7 colours of the visible white light spectrum?

Slide 23 - Open question

Forces and Motion
Lesson 12. 
Dispersion of Light

Slide 24 - Slide

Slide 25 - Slide

Triangular prism

Slide 26 - Slide

A ______________ is a solid shape such as the one that Newton used.
A
mirror
B
prism
C
metal
D
surface

Slide 27 - Quiz

  • Dispersion means splitting light into different colours.
  • Dispersion happens because light is refracted.
  • Each of the different colours of light that make up white light is refracted through a slightly different angle. 

Slide 28 - Slide

Slide 29 - Video

Slide 30 - Video

Self-survey: Rate your level of understanding and participation in this lesson.
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Slide 31 - Poll