1.3 Light Flashcards
(16 cards)
what does the retina do?
Where the image forms, contains light-sensitive cells that produce a signal
what does the iris do?
the coloured part of the eye, a muscle that controls size of the pupil
what does the pupil do?
The hole where the light goes in
what does the cornea do?
transparent outer layer of the eye
what does the lens do?
together with the cornea focuses the light onto the retina
Light second is a unit of
distance
Materials which transmit and scatter light are
translucent
Light refracts when it travels from one medium to another if its speed in the two media is different. What will happen at the boundary between the media, if the light is not travelling perpendicular to the boundary?
The light wave’s direction changes.
Describe the shape of a convex lens
Thicker in the middle then at the edges
When you look in a mirror, you see an image behind the mirror. Why is this?
Our brain thinks the reflected rays have come from there.
When you look in a mirror, you see an image behind the mirror. Why is this?
Our brain thinks the reflected rays have come from there.
The image is formed on the
retina
Light enters the eye and converges on the
retina
Which part of the eye has the same function as the aperture in a camera?
pupil
Which part of a camera has the same function as the retina in a human eye?
charged couple device (CCD)
Blue and green are primary colours, so when blue light is shone at a green filter ________ light emerges
no
