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
What are the 2 types of lenses
Converging/diverging
When light rays pass through the lens in our eye the light from the top of the object focuses on the bottom of the retina. Light rays from the bottom of the object focus on the top of the retina
Big daddy’s
White light - refracts - disperses into the spectrum
Info red
Red
Orange
Yellow
Green
Blue
Indigo
Violet
Ultra violet
How does does the light spectrum work
The beam of white light hits the prisms surface and refracts, the different colours refract by amounts blu-violet bends the most while Inca red and red bend the least
Write down 7 types of rays
Gamma,Xray,ultra violets,visible,info red, microwave und radio
Which type of radiation has the longest waves
Radio
What is the relationship between wavelengths and energy
Shorter have length more energy
What are x-rays used for
Medical imagery
Checks for cracks in metal objects
What are uv rays used for
Fluorescent lights
Check for invisible writing on blank paper
What is infrared used for
Heaters
Toasters
Grills
What ska microwave used for
Microwave oven
Mobile phone
What are radio rays used for
Radio signals
Tv signals
What a transverse wave
It’s a wave which the vibration particles within the wave are perpendicular to the direction that the energy of the wave is being transferred
