2. Light Flashcards
What is a perpendicular line?
A line that is at right angles to another line.
How does light travel?
In straight lines
In waves
What is “The Normal”?
The normal is a line perpindicular to the boundary where the 2 mediums meet
What is a medium?
A material that allows light waves to pass through.
How does light “bend” when moving from a less dense to a more dense medium
It bends towards the normal
How does light bends when moving from a more dense to a less dense medium?
It bends away from the normal
Does light move at the same speed through every “medium”?
No
The denser a material is the slower light will move through it
What is meant by an “opaque” substance?
A substance that doesn’t allow light to travel through it.
What is meant by a “transparent” substance?
A substance that lets light travel through it.
What is meant by a “translucent” substance?
A substance that lets some light through but makes the image fuzzy
What happens to light when passed through a convex lens?
It comes together to a focus (focal ) point
What does “converge” mean?
To come together
What happens to focal point lemgth lens as convex lens gets thicker?
It decreases
What happens to light when it passes through a concave lens?
What does “diverge” mean
To move further apart
What is short sightedness and how is it corrected?
What is long sightedness and how is it corrected?
What is the connection between the angle of incidence and the angle of reflection?
They are the same
What colours does white light split into?
What are the 3 primary colours in Science?
Red
Green
Blue
What are the 3 secondary colours and what primary colours added together make them?
What is the science colour wheel?
How does a colour filter work?
It absorbs some colours of light and transmits others
what does transmit mean
to pass through
what does absorb mean?
to stop from passing through
How does a periscope work?
What happens when we shine white light on “coloured” surfaces
Some colours are absorbed and others reflected
What happens when we shine white light on coloured surfaces
Secondary coloured surfaces reflect the 2 colours which make them and absorb the other.
