Physics Book 1a Flashcards
What does the iris do
Controls how big your pupil gets when light enters it
What does the cornea do
The Cornea focuses on what you see
What does the pupil do
The pupil lets light into your eye
What does the lens do
The lens gets fatter or thinner and focuses on the image you see
What does the retina do
The retina contains 130million light sensitive cells
What does the optic nerve
The optic nerve receives signals from the light cells and sends them to the brain where the picture is seen
When does refraction occur
Refraction occurs when a wave of light moves from 1 medium to another different medium and it changes speed
When light moves from air to glass it
Slows down
When light moves from glass to air it
Speeds up
What happens when a light ray enters the block at 90°
It carries straight on
What happens when the light ray enters the block at any other angle
It bends
What happens when the ray comes out of the block
It carries straight an and speeds up
What happens when the ray comes out of the block at any other angle
It bends back again to the same angle it went in at
Compare the direction of the ray entering the block with the direction of the ray emerging from the opposite side
They’re parallel but no longer in line with each other
Give an example of an animal who would need to understand refraction to live
Archer fish, seagulls, Penguins
