Light Flashcards
What happens to light rays when they pass from a less dense to a more dense medium?
They move towards the normal
What does “diverge” mean
To move further apart
Name the 3 primary colours in Science
Red
Green
Blue
What is meant by descibing a substance as a “medium”?
It allows light rays to travel through it
What does “converge” mean?
To come together
How do light rays pass through a convex lens (diagram)
Describe the “normal”
A line at 90 degrees to the boundary between two substances acting as mediums
What is meant by a “translucent” substance?
A substance that lets some light through but makes the image fuzzy
What colours make up the rainbow?
What is meant by an “opaque” substance?
A substance that doesn’t allow light to travel through it.
Which 2 primary colours are mixed to make yellow?
Green and Red
Show how white light refracts in a prism
Why do we see certain substances as coloured?
The substance simple absorbs all the other colurs of the spectrum and reflects the colour we see.
No substance is truly coloured. It simply absorbs and reflects different wavelengths of white light
Which 2 primary colours are mixed to make cyan?
Green and Blue
Name the 3 basic secondary colours in Science
Yellow
Magenta
Cyan
Which 2 primary colours are mixed to make magenta?
Red and Blue
i) angle of incidence
ii) angle of reflection
iii) The normal
Show how refraction occurs when a prism is used
The example shown is for a single wavelength of light
Show how raindrops refract sunlight to show a rainbow
How do light rays pass through a concave lens?
