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Ch. 15 Mirrors and Lenses
Transcript of Ch. 15 Mirrors and Lenses
Light sources send out light waves in all directions.
Light sources can be a certain light wave coming from a reflection or an object.
A mirror may look like if there is something behind it
but really, no light rays travel through it.
~ Plane Mirrors
- Are flat, smooth mirrors
An image which your
brain perceives even
though no light rays actually pass through it.
~a mirror that is curved inwards
is the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
These are the normal household mirrors a person would have.
~ A Convex mirror is a mirror that is curved outwards like the back of a spoon.
How concave mirror works
~An image formed by a concave mirror will change depending on where the object is located
Mirrors that magnify
The focal point is within the middle of the mirror and the objects position.
At times you may look at a mirror
but yet, sometimes you realize that
the image turn out smaller. This is
called a magnifying mirror.
By Gael And Tom
Lenses are a transparent material
with at least one curved surface that causes light rays to bend or
refract as they pass through.
Lenses are the circular glass around on your camera.
Convex lens are thicker in the middle and thinner in the edges which makes light rays go inward.
~ thinner in the middle and thicker at the edges
Lenses and eyesight
~ cornea is a transparent covering on your eyeball
~ retina is the inner lining on your eyeball
Focusing farsighted and nearsighted
Farsighted eyes that can see further but cannot focus on nearby objects. People that are over 40 years old can probably cannot focus more than a 1m. Nearsighted is the exact opposite.
People occurs when the surface of the cornea is
Uses a lens or a concave mirror that is much larger than your normal eye.
Uses a concave mirror, a plane,
mirror and a convex lens.
Uses two convex lenses with
relatively short focal lengths to
magnify small close objects.
Here Is A Video On Lens And Mirrors