Waves, Light and the EM Spectrum Flashcards
What is the iris
The coloured part which controls the size of the pupil
How big is the pupil in bright light
Small
What is the cornea
A clear window to the eye which helps focus light rays,
What is the pupil
The hole that allows light into the lens and retina
What is the lens
The place where light is adjusted to create a focused image on the retina
What is the retina
The wall at the back of the eye containing 130,000,000 light sensitive cells
What does the optic nerve do
Carries the electrical signals from the retina to the brain where the picture is seen
What happens when a light ray enters the block at 90degrees
It carries on straight but slows down
What happens when the light ray enters the block at any other angle but 90degrees
It bends and slows down.
What happens when the ray leaves the block at 90degrees
It speeds up
What happens when the ray leaves the block at any other angle
It goes back to the same angle it went in and it is parallel
When light moves from air to glass it……
Slows down
When light moves from glass to air it …
Speeds ul
Does light bend when it enters a different material at 90degrees
No
