8.5 DISPERSION OF LIGHT

8.5 DISPERSION OF LIGHT

by KASMAWATI Moe

By the end of this lesson, You will be able to

​8.5.1 communicate about the dispersion of light.

​

8.5.2 explain with an example the dispersion of light in daily life

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Sucessfull criteria

8.5 Dispersion of light

List the seven colour form on rainbow in the correct order

​Explain the dispersion of light in formation of rainbow by drawing

​How does a rainbow form?

How is the rainbow formed?

• Rainbows are created by the dispersion of sunlight by raindrops. Red light arrives at the eye of the observer from the upper drop while violet light arrives from the lower drop. Other raindrops yield the other colors produce a continuous arc in the sky.

Photonics Engineer

• Photonics is the science of using light to generate energy and detect or transmit information.

• Photonics engineering aims to develop innovative and new products for telecommunication, manufacturing, medicine and construction.

Splitting light

• You can see the colours of the rainbow for your self by sending a ray of white light into a glass of prism.

• A prism is a triangular glass box

• When the light enters the prism it bends-it is refracted. It also bends as it leaves the prism.

Splitting light

• The white light split up into a spectrum of colours. Same colours as you see in the rainbow.

• The splitting up of white light into separate colours is called dispersion

Dispersion

This happens because of refraction. When white light enters a block of glass, some colours bend more than the others. Violet bends the most, red the least.

Multiple Choice

Which colour is refracted most as it passes through the prism?

• red

• orange

• violet

• blue

Multiple Choice

Which colour of light is refracted more by prism?

• green

• blue

Multiple Choice

Which colour is refracted least as it passes through the prism?

• red

• orange

• violet

• blue

Multiple Choice

What is the transparent material that causes this?

• spectrum

• splitting light

• water(raindrop)

Multiple Choice

What is disperse means?

• spread

• bend

• bounce back

Multiple Choice

How many components of white light?

• 5

• 6

• 7

• 8

Multiple Choice

The breaking up of white light into its component .

Based on the statement given, name the process that takes place in the white light.

• Dispersion

• Reflection

• Refraction

• Scattering

Multiple Choice

Why is red light is at the top while violet at the bottom of the spectrum?

• Red light has the slowest speed so it is refracted the least

• Red light has the highest speed so it is refracted the least.

• Violet light has the highest speed so it is refracted the least

Multiple Choice

What will happen if a second inverted prism is placed behind the first prism?

• double rainbows form

• a white light forms

• the lights of spectrum will be in reverse

Multiple Choice

This is the example of dispersion of light

• sky looks bright orange in the evening

• shadow

• Pool seems shallower

• rainbow

Multiple Select

What is this ?

• Rainbow

• Rain

• Sun

• Cloud

Multiple Choice

How many colors are in the rainbow ?

Multiple Choice

What are the rainbow colors ?

Multiple Choice

can we see rainbow at night?

Multiple Choice

We cannot see rainbow in the night because there is no 

• wind

• light

• heat

• electric

Multiple Choice

Why is red light is at the top whileviolet at the bottom of the spectrum?

• Violet light has the medium speed so it is refracted the least.

• Violet light has the highest speed so it is refracted the least

• Red light has the slowest speed so it is refracted the least

• Red light has the highest speed so it is refracted the least.

Multiple Choice

Why is the spectrum of light seperated into its components of colour when white light is directed to a prism?

• The different colours in the white light bend away from the normal line at different angles when entering prism

• The different colours in the white light bend towards the normal line at different angles when entering prism

• The different colours in the white light bend away from the normal at same speed to each other when entering prism

• The different colours in the white light bend towards the normal at same speed to each other when entering prism

Multiple Choice

What do water droplets in a rainbow act like?

• prisms
• flashlights
• reflectors
• lasers

Multiple Choice

This is the example of dispersion of light

• sky looks bright orange in the evening

• shadow

• Pool seems shallower

• rainbow

Multiple Choice

Light dispersion occurs when light passes through two mediums of _______ densities and produces a spectrum of colours when it is refracted.

• same

• different

Multiple Choice

Which one is the true order color when light is dispersed?

• Blue, Orange, Red, Green, Indigo, Purple,Yellow

• Orange, Red, Blue, Indigo, Purple, Green, Yellow

• Red, Orange, Yellow, Green, Blue, Indigo, Purple

Multiple Choice

What is disperse means?

• spread

• bend

• bounce back

Multiple Choice

What will happen if a second inverted prism is placed behind the first prism?

• double rainbows form

• a white light forms

• the lights of spectrum will be in reverse