Refraction Flashcards
The eye and brain assume that
Light travels in a straight line and then extends to all incoming rays of light backward until they extend until they intersect
principle focal point
a lens appears to focus incoming light that is parallel to the optical axis.
a light ray entering a converging lens in the middle will tend to
Travel in a straight line
a virtual image is produced by a
diverging light rays that our brains trace back.
we can only see images due to
diverging light rays
what happens to the image produced by a converging light ray when the top half of the lens is covered?
it gets dimmer because fewer light rays are diverging.
why does the image become blurry when we move the screen closer to the lens?
because the light rays do not converge at the appropriate image distance.
true or false we will see the image at the location of the image.
false
The focal point is on which side
right or positive for converging. left or negative for diverging
Apparent depth equation
Observed = d actual( n observer/ n actual)
true or false virtual images can be seen on a screen
false, because the light rays forming a virtual image do not actually converge at the image location they only appear to diverge in our brains. therefore the light does not converge or diverge at a screen. you need a lens to see a virtual image.
what does it mean for an image to be “ in focus”
all the light rays from the same point on the object will converge on the same point on the image
true or false an observer can see light rays passing through the real image location
true
image point
the point at which light rays converge and diverge/appear to diverge.
