how do we see things? 6.2 Flashcards
if light is given out by an object then it is…
OMITTED
If light passes through an object it is…
Transmitted
If light stays inside an object it is ….
ABSORBED
how can you measure light intensity?
By using a light meter
What is the unit used to measure light?
We use lux.
what is the light level at midday?
about 20,000 LUX
what is it called when an object does not give out light?
we call the object non-luminous
how do we see things?
light is reflected off them and into our eyes.
what part of the eye does what?
PCLRC
P-the light enters through the PUPIL
C- light focuses in da CORNEA (transparent outer layer of eye)
L- cornea is helped by LENS (small sack of jelly like material)
R- Image is formed in the back of the eye by the RETINA
C- light sensitive cells called RODS and CONES that absorb light.
what do rods and cones do?
They convert the light into signals that they then send to the brain along the optic nerve.
is Talha smart?
yes. absolutely. most defiantly.
