LIGHT and EYE Flashcards
What term do you use when light passes through an object?
Transmit
What type of object will let a little amount of light to pass through
Translucent
In which type of reflection is an image formed?
Specular reflection
Describe why a lamp is luminous?
because it gives out (emit) light
What does the law of reflection say?
That the angle of incidence will be equal to the angle of reflection
What do you call the line which you draw at 90o from the surface/mirror which light is hitting?
The normal
What is meant by a light-year?
The amount of distance that light travels in one year
How will the direction of light change if it is moving from air into a glass block?
It will bend towards the normal as it is slowing down as it enters the glass block
Describe the difference between primary and secondary colours.
Primary colours are the ones that your eyes detect, whereas secondary colours are made from mixing primary colours together
Explain why light passing through a green filter appears green.
All other colours of light are absorbed, and only green light is allowed to pass through
How can your eyes detect an object?
Light hits the photoreceptors at the back of your eye; this is turned into an electrical impulse that is sent along the optic nerve to the brain
What is the role of the lens in your eye?
It focuses the light entering your eye and enables you to see
