Light Flashcards
(22 cards)
what are luminous abjects
sources of light
do non luminous object produce their own light
no
define translucent
light is scattered
nd
most light is transmitted
define opaque
no light is transmitted so a shadow is produced
what can light travel through
gases, some solids and liquids and a completely empty space, a vaccum
what is a prism
refracts different colours of light by different amounts This disperses light into a continuos spectrum of colours
what does the law of relflection state
the angle of incidence is equal to the angle of reflection
what does whether or not you can see a clear reflected image reflect on
how smooth a surface is
what is refraction
when light changes direction when it travels from one medium to another.
why does refraction happen
because light travels at different speeds and different materials
name the 2 ways waves of light will be refracted
towards the normal if the slow down such as going from air to glass
away from the normal if they speed up such as going from water to air
what do lenses use refraction for
spread out or focus light
what do photoreceptors do
detect the light hitting your retina and send an electrical impulse to your brain
explain how cameras work in similarity to your eye
light passes through an opening and a real image is fomed on a screen or film, just like when light entering your eye is refracted by the lens and the retina focuses it making an inverted image
define angle of incidence
The angle between a light ray and an imaginary line that is 90° to the surface.
define specular reflection
When light hits a smooth surface and bounces off in one direction, like in a mirror.
define diffuse scattering
When light hits a rough surface and bounces off in many directions.
define retina
The part at the back of the eye that receives light and helps you see.
define photoreceptor
A special cell in your eye that senses light.
define prism
A clear object that bends light and splits it into different colours.
define charge coupled device
A tool in cameras that turns light into electronic signals to make a picture.
