6.2 - extending human vision

how many and what type of lenses do most microscopes use

2 convex

what are the types of telescopes

refracting telescope, reflecting telescope

how does a refracting telescope work

2 convex lenses

how does a reflecting telescope work

light bounces off the concave mirror to a plane mirror to a small convex lens

what happens to a lens when it is too big

it bends under its own weight and image is distorted

what type of telescope is similar to a microscope

refracting

when the lens is bigger what is it more prone to

imperfections

what are some uses for lasers

optical fibers, laser eye surgery

what are optical fibers used for

internet, phone lines

what are optical fibers

transparent glass fiber tubing that bounces light from one end ton another

how fast does information travels in optical fibers

the speed of light

what does laser eye surgery do

reshapes the cornea to improve your vision

what happens in laser eye surgery

cut open your cornea, use a laser to burn and reshape it, seal it back on

what are some side effects of laser eye surgery

vision may get worse, night vision problems, chronic discomfort, small blurriness

who is laser eye surgery available to

only adults