Light And Sight Flashcards
How does light get to our eyes
Light reflects of an object then the reflected rays enter our eyes
What is light
Light is a form of energy belonging to the electromagnetic spectrum
What is energy
Energy cannot be created or destroyed it can only be transferred from one form to another
What can energy be stored as? (Gecknt)
Gravitational potential,elastic potential,Chemical,kinetic,nuclear, thermal
Define luminous
Generates its own light
Define Non luminous
Object either reflects light that hits them or absorbs it
Define reflection
When light bounces off an object
How does light travel
In straight lines
Does light need a medium to travel through?
No
Which travels faster light or sound
Light
How fast does light travel
300,000 kilometres per second
Refraction
When light goes through an object but changes direction
It is the bending of lights from one medium into a medium with a different density
Which way does light bend from Air to glass (denser medium)
Towards the normal
What way does light bend from glass to air (less dense medium)
Away from the normal
What are the Color’s of white light
ROYGBIV
Biggest wave length
Red
Smallest wavelength
Violet
If waves are shorter…
Then more of them will pass by every second we say they have a higher frequency
What does white and black objects do when light hits them
White objects reflect all wavelengths of light
Black objects absorb all wavelengths of light
Define emit
Produce something
Define transmitted
When light travels through a material
Angle of incidence equals…
Angle of reflection
Define refraction
When light is transmitted through a transparent medium but changes direction
Which lens disperse light
Concave lens
Light is what type of wave
Transverse
What factors affect the speed of light
The density of the medium that the light wave is traveling through
Convex lens
Cause parallel light rays to converge
Thiss means that the rays meet and form an image
Concave lens
Concave lenses cause parallel light rays to diverge
This means that they move apart and do not actually cross.
Which type of lens cause light rays to diverge
Concave lens
Which type of lens causes light rays to converge
Convex lens
Focus point (define)
The focus is the point where parallel light rays converge
Dispersion
Spitting up white light into seven colors roygbiv
White light from the sun…
White light from the sun is made up of multiple frequencies blended together when light is shine through a triangular prism it is separated in seven different colours (roygbiv
