Light and shadows Flashcards
We need light to ______
see
Light can come from many different sources, such as?
Sun, stars, torches, lamps and candles
Light travels ________than anything in the universe and it always travels in ____________.
Faster
straight lines
Which animals are sources of light?
fireflies and glow worms.
_____________
happens inside fireflies and this helps them to light up!
A
chemical reaction
What is an chemical reaction?
chemical reaction
This is when one or more substances react with each other creating a new substance. When you make a cake or bake bread, chemical reactions take place and a new substance is formed.
Something that produces its own light is known as a _____ of light.
source
Fire, lamps and _____ are all examples of sources of light.
stars
Light travels in _____ lines.
straight
Light is the fastest thing in the ______ .
universe
What is a light source?
Something that produces light
Which of these is a source of light? Sun, moon or earth?
sun
How does light travel?
Light travels in straight lines.
When light hits an object, it is
_________
by that object and travels in straight lines to our eyes.
reflected
What is the meaning of ‘‘reflect’’
When something like light, heat or sound bounces off a surface, it is reflected.
Our eyes take in some of this light and information is sent to the _______. This is how we _____ the object.
brain
see
How do we see?
Light travels from the light source to the object where it is reflected into our eyes so we can see.
Some objects such as shiny metal objects _______ light better than dark materials which ________ some of the light.
reflect
absorb
Light rays hit the ball and then ___________ into our eyes.
reflect
What is light?
Energy that zooms around quickly
What is reflection?
Reflection involves a source of light and a surface. The light travels towards the surface and bounces off of it.Mirrors reflect lots of light, but most objects reflect at least a bit of light.
How reflection works?
When light from an object is reflected by a surface, it changes direction. It bounces off the surface at the same angle as it hits it.
Smooth, shiny surfaces such as mirrors and polished metals _______ light well. Dull and dark surfaces, such as dark fabrics, __________ light so they do not reflect it well.
reflects
absorb
In order to see, light will reflect off an object and travel into our ___.
eyes
When the Sun ray hits the black umbrella some of the light is _________ back but some is also ___________ by the dark material.
reflected
absorbed
Which of the following objects reflects the most light?
A black curtain,
Soil or a metal car?
A metal car
When light is reflected by a surface, it ___.
changes direction
What happens when light hits a black wall?
It’s absorbed
Which part of the eye controls how much light enters the pupil?
Iris
What is an shadow and how is it made?
A shadow is a dark shape made when light is stopped or blocked by an object or a person.
Some objects are ________ such as stone, metal and wood. This means light doesn’t travel through them. Light bounces back off the object. On the other side of the object a shadow is formed.
opaque
Why do larger objects produce larger shadows? This is because they block a larger amount of light. If the light source is close to the shadow, this also leads to a larger shadow.
This is because they block a larger amount of light. If the light source is close to the shadow, this also leads to a larger shadow.
Why do some shadows, like the palm trees, change in size?
This is because the distance from the light sources changes