Physics 3 8J Light Flashcards
What happens to light when it hits an opaque material?
All light is absorbed and none passes through.
What happens to light when it hits a transparent material?
All light passes through.
What happens to light when it hits a translucent material?
Only some light passes through.
Name 3 sources of light.
Any three from:
- Sun
- Fire
- Light bulb
- Computer screen (or similar)
- Torch etc
What is the relationship between the angle of incidence and the angle of reflection?
They are the same.
What is the role of the cornea?
Refracts (bends) light on to the lens
What is the role of the lens?
Focuses light on to the retina
What is the role of the pupil?
Controls the amount of light entering the eye
What is the role of the retina?
Contains cells that are sensitive to colour.
What is the role of the optic nerve?
Carries impulses from the eye to the brain
What is the name of the glass triangle through which white light can be split?
Prism
Name, in order, the colours of the spectrum
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
How can you change the colour of light emitted from a light box?
Filter
Why do some objects appear black?
They absorb all the colours of the spectrum
Why do red objects appear red?
They reflect red light and absorb all other colours.
What happens to light when it passes from air to glass?
It slows down and refracts towards the normal
Name the three primary colours
- Red
- Green
- Blue
Which primary colours make the secondary colour cyan?
Green and Blue
Which primary colours make the secondary colour yellow?
Red and Green
Which primary colours make the secondary colour magenta?
Red and Blue
What is the name of the dashed line at 90 degrees to the mirror?
The normal line
