light 8j Flashcards
The properties of light are:
Light travels in straight lines (proved by shadows)
Light travels very fast (330 million m/s)
What is a plane mirror?
A mirror with a flat surface.
State the colours that make up white light:
Red, Orange, Yellow, Green, Blue, Indigo, Violet
What is this called?
A spectrum
When shining light through a prism dispersion happens, which colour bends the least and which colour bends the most:
Red bends the least and violet bends the most
State the law of reflection:
Angle of incidence= Angle of reflection
What does refraction mean?
It means bending of light when it passes into a different medium.
Why does refraction happen?
This is because light works in different speeds in different mediums.
Describe why a blue shirt looks blue:
When white light shines onto a blue shirt it will reflect the blue light. All the other colours in the white light will be absorbed.
State how a camera and an eye work in a similar way:
They both have parts that change to control the amount of light that enters.
Both are sensitive to light.
Both create an image.
What are the names that you will find in a retina?
Rod (shade) cells and Cone (colour) cells
What does opaque mean?
A material that light cannot pass through.
What does transparent mean?
A material that allows light to travel through it.
What does translucent mean?
A material that allows a small amount of light to travel through it, some is absorbed and some is reflected.
What type of wave is a light wave?
Transverse wave
