Light and sound Flashcards
(15 cards)
Name the 2 types of light sources
1.Luminous (make their own light)
2.Illuminate (needs light shining on them)
Which energy pathway transfers light from source to surrounding areas?
Radiation pathway
Does brightness increase or decrease with distance from the light source?
Decrease
What does transparent medium mean?
Light travels through clearly, like through clear glass.
What does translucent medium mean?
Light travels through but not as clearly, like through a frosted window.
What does opage medium mean?
Light does not pass through it, causing shadows.
What is the equation for the law of reflection?
The angle of incidence = the angle of reflection
True or false: All surfaces reflect light and obey the law of reflection?
TRUE
What does the cornea do?
Refracts light before it enters the eye
What does the iris do?
Controls the size of the pupil
What does the pupil do?
Lets light enter the eye
What is the retina made up of and what do they do?
Made up of cells that detect light
What does the optic nerve do?
Carries electrical signals to the brain
What is a ray?
An imaginary line drawn to represent the path light is travelling
What 3 colours do eyes detect?
Red, green and blue
