science home learning task year 7 light · 2019-04-24 · year 7 light name tutor group teacher...
TRANSCRIPT
Parent/Carer Comment
Staff Comment
Target
Science Home Learning Task
Year 7
Light
Name
Tutor Group
Teacher
Given out: Monday 29 April
Hand in: Tuesday 7 May
Investigating Science
Welcome to your Science homework booklet. This booklet is designed
to give you some extra practise on the key areas in the “Light” section
of the course.
You need to carry out tasks 1, 2, 3 and 4.
Don’t forget to fill in the last page and ask a parent/carer to sign the box on the front.
TASK 1- Light and the eye
Light is needed to help us to see objects. Answer the questions below about light.
1. Circle the correct bold word in the sentences below.
The Sun is luminous/non-luminous because it emits/transmits light.
The light reflects/transmits off an object that is luminous/non-luminous into
your eye so that you see it.
Most objects do not transmit light – they are translucent/opaque.
2. Match the following definitions to the correct keyword from the box below.
3. The diagram below shows a book that needs light to be seen. Draw lines and
arrows between the objects to show how the book can be seen.
Definition Keyword
Gives out light
Does not allow light to travel
through it
Objects that you can see through
Light can pass through but it is
scattered as the object is frosted
Does not give out light
Light bounces off a surface
Light is taken into a material
Transparent Luminous Opaque Non-luminous
Translucent Absorbed Reflected
4. How long does it take for light to travel from the Sun to the Earth?
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5. What is the speed of light?
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6. Can light travel through a vacuum? Explain your answer.
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7. The diagram below shows the inside of the eye. Label the parts of the eye using
the words in the box below.
What is the function of the different part of the eye? Find out and write your
answer in the space provided.
Pupil
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Iris
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Retina
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Optic nerve __________________________________________________________________
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Lens Cornea Optic nerve Iris
Pupil Retina
Lens
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8. How do all the different parts of the eye help us to see an image? Write a full
description of how the eye works in the space below. Use as many of the
keywords from the box as you can in your answer.
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Light Reflected Optic nerve Lens
Pupil Retina Image Inverted
TASK 2 - Reflection
1. Match the keyword to its meaning by drawing lines between them.
2. When light hits a surface such as a mirror, it bounces off the mirror – it is
reflected. When light is reflected in this way it follows a law known as the “law
of reflection”. The diagram below shows the “law of reflection”.
Plane
mirror
Virtual
image
Incident ray
Normal
Reflected ray
Line at 90˚ to the
mirror
An image that
appears to be inside
a mirror
A ray that comes
from a light source to
the mirror
A mirror with a flat
surface
A light ray that
bounces off a mirror
What is the “law of reflection”? Use the diagram above to help you.
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3. Using the “law of reflection”, complete the table below.
Angle of incidence Angle of reflection
28˚
45˚
80˚
60˚
4. The diagrams below show what happens to light when it hits a smooth and a
rough surface. The lines on the diagrams show the rays of light.
30˚ 30˚
Using the diagrams above, explain why the light rays are reflected differently
from a smooth and rough surface.
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TASK 3 – Refraction
Refraction is another property of light that happens when it travels from one medium to
another. For example from air to water. The diagram below shows what it looks like
when light is refracted.
1. Using the diagram on the previous
page, explain what has happened to the light ray when it has enetered the water.
Smooth surface Rough surface
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2. Look at the diagram below of light moving through a glass block. This shows
what happens to light when it travels through different materials.
a) On the diagram, mark the line that represents the normal. Also mark the angle
of incidence and the angle of reflection, the incident ray and the reflected
ray.
b) Using the diagram on the previous page, write an explanation for the change in
the path of the light. Include words from the box below in your answer. Hint:
think speed.
Glass block
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3. How does a lens work? Complete the sentences below using the words from the
box.
We have a lens in each of our ________________. This is a ______________
lens. The job of this lens is to _______________ the ________________ so that
we can ___________. The point at which the rays cross is called the focus or the
_______________________________. The light is ______________________
as it goes into the lens and as it comes back out.
4. Using the information from the previous page, complete the diagram below to
show what happens to the light as it passes through the lens.
Light Slows down Normal Speeds up
Glass Towards Particles Away from
Eyes Light Focus Refracted
Convex See Focal point
TASK 4 – Colour
1. White light is made up of seven different colours of light. Using coloured pens or
pencils, show what happens to white light when it enters a prism.
Write a descrption below of what you have shown in your diagram.
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2. We can make all the colours of light using three colours. These are known as the
primary colours. Write down the three primary colours of light.
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The primary colours of light can be mixed to make the secondary colours.
On the diagram above colour the outer parts of the circles in the primary colours
and where they overlap, in the secondary colours that they make. If you don’t
have the correct colours, label your diagram instead.
Use the extra space below if you need to describe the detail/labels on your
diagram.
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Primary colour
Primary colour
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3. Objects appear different colours because of the colour of light it reflects. Explain
why each object below looks the colour that it does in terms of the colour of light
it reflects.
a) Why does a black cat look black?
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b) Why does a piece of paper look white?
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c) Why does a strawberry look red?
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4. Coloured filters affect coloured light and the appearance of coloured objects.
Show the colour of light coming from the filter by colouring it in.
Write down the colour that you would see if the filter was blue instead of red.
Explain your answer.
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Complete the table below to show the colour a book would appear using the
different filters listed.
Colour of filter Colour of book Appearance of book in the light
blue blue
red blue
red yellow
red white
blue white
Self Evaluation of my Homework
I am a R____________________ learner. I know this because:
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I believe that my effort and attitude to learning for this booklet is a:
1 2 3 4
I know this because:
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