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6.2.2 a) refraction + reflection on microscopes + telescopes - Coggle…
6.2.2 a) refraction + reflection on microscopes + telescopes
technology advanced by improved knowledge
Telescopes
refracting
#
uses 2 lenses
to focus light
make object look closer
than you think
reflecting
#
uses mirrors instead of lenses
to collect light
light travels down telescope tube
to large primary mirror
reflect light back up tube
to smaller secondary mirror
reflecting light to eyepiece
Microscopes
compound microscope
uses 2 eyepieces
uses lenses + light
enlarge subject
ranging from 10x-15x
achieve 1000x
objective lenses used
stereo microscope
uses 2 optical paths
at different angles
view subject three-dimensionally
typical range
20x-200x
digital microscope
uses digital camera
view objects not visible to naked eye
display image onto computer screen
typical range
20x -7000x
pocket microscope
used for handheld imaging
of specimens/objects
typical range
25x-100x
work
let light pass
through biconvex lenses
refracted to eye
scientific law/theory on which tech is based on
Law of refraction (Snell's Law)
explains
behaviour of light-rays
as spread across sharp interface
between 2 transparent dielectric media
carrying charges + free carriers
move under influence electric field
as light moves from air to glass
wavelength decreases
Law of reflection
flat
if light ray bounces
off flat, smooth surface
incident angle = reflected angle
convex
light rays diverge
after reflection off convex surface
diverging mirror
concave
light rays converge at point
after reflection off concave surface
converging mirror
impact of scientific knowledge on tech development
Snell's law
use of fibre optics
using total internal reflection
light reflected from fibre optic core
propagates down core of fibre
fibre optic cable contains
2 different mediums
different refractive indexes
incident angle
be found where ray refracted 90 degrees
never escaping medium
travelling forever through fibre optic core
reflection
mirrors
