Light Flashcards
What is light?
What does transparent mean?
Light can pass through completely
What doers translucent mean?
Lets light partially pass through
What does opaque mean?
Lets no light pass through
What is a ray box?
A box capable of producing a single ray of light
How do we represent the ray coming from a ray box?
A single staright line with an arrow
What is the “normal”?
A line that is 90 degrees to the surface of a substance that is interacting with light
How does the sngle of reflection compare to the angle of incidence?
What is meant by a “medium”?
A material that light rays / waves pass through
What is meant by a “boundary”?
The point where 2 different mediums meet
What is refraction?
The bending of light when it moves from one medium to another
Why does light refract (bend) when it moves from air to glass?
It slows down because the glass is more dense than the air
What is the incident ray?
The ray of light that interacts with another substance
What type of lens is this?
Convex
Where are convex lenses found?
What happens to the position of the focal point when a convex lens is made thicker
It moves closer to the lens as the rays converge more quickly
What type of lens is shown?
Concave
What happens to light rays when they pass through a concave lens?
They diverge
What do we call a piece of glass shaped like this?
What 7 colours make up natural white light from the sun?
Which 2 primary colours are mixed to make yellow?
Green and Red
Which 2 primary colours are mixed to make magenta?
Red and Blue
Which 2 primary colours are mixed to make cyan?
Green and Blue
How does a primary colour filter work?
It absorbs the 2 other primary colours but transmits the primary colour of the filter
How does a secondary colour filter work?
It transmits the 2 primary colours that make up the secondary colour but absorbs the 3rd
Why do objects appear white?
Because they reflect ALL of the primary colours shone on to them
