Reflection & Refraction
What is refraction?
When light waves bend and look broken.
Which colour roof should be used to absorb more sunlight in the winter?
Dark colours, black for example will absorb more sunlight so that would be the best choice.
This blocks some light and lets some light pass through.
Translucent
In order for light o bounce off a surface in a straight line the surface must be _______________?
Flat and smooth
Why do we see the colour orange when we look at the orange fruit?
When light shines on an object, the object absorbs some of the light waves and reflects some light waves. You do not see the absorbed colours only the reflected colours (in the case of an orange you see the orange colour)
Why does refraction happen?
It occurs when light waves go from air to water.
What colour t-shirt should you wear to keep cool in the summer?
White reflects the most light, so a white t-shirt would keep you coolest on a hot day in the summer.
Lets all light pass through.
Transparent
A prism is a type of ________?
This type of lens is thick on the ends.
Concave
What could you draw to show an example of refraction?
A straw in a glass of water, make it look like it doesn't connect properly (so it looks bent)
List two opaque objects.
This type of objects is the best for making shadows.
Opaque
True or false - Alexander Graham Bell discovered that the sun's white light is really a mixture of colour.
False - It was Sir Issac Newton.
Light waves __________ when they hit something.
change direction
Explain the difference between light waves that reflect on a smooth, shiny surface and light waves that reflect off of a rough surface.
On a smooth surface - light waves reflect and bounce off in one direction.
On a rough surface - light waves reflect and bounce off in many directions.
ROY G BIV stands for?
red, orange, yellow, green, blue, indigo and violet
Humans are this type of material
Opaque
Occurs when light is blocked by an object.
Shadow.
This type of lens is thick in the middle.
Convex
To bounce back is ________?
Reflection.
This is a form of natural light?
firefly, angler fish, sun
A window is this type of material _________ because it__________.
Transparent, because it lets in all the light.
Objects under water appear different because of reflection?
False - They appear different because of refraction (makes objects look bent)
Light waves move in _____________
Straight lines called rays