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Refraction Inquiry-based Lecture. Inquiry 1 Put the pencil in an empty beaker and see it on the side...
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Transcript of Refraction Inquiry-based Lecture. Inquiry 1 Put the pencil in an empty beaker and see it on the side...
![Page 1: Refraction Inquiry-based Lecture. Inquiry 1 Put the pencil in an empty beaker and see it on the side of the beaker. What do you see? Now fill the beaker.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da05503460f94a8baa6/html5/thumbnails/1.jpg)
Refraction
Inquiry-based Lecture
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Inquiry 1• Put the pencil in an empty beaker and
see it on the side of the beaker. • What do you see?• Now fill the beaker with water until you
cover half of the beaker. See the pencil on the side of the beaker.
• What do you see?
![Page 3: Refraction Inquiry-based Lecture. Inquiry 1 Put the pencil in an empty beaker and see it on the side of the beaker. What do you see? Now fill the beaker.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da05503460f94a8baa6/html5/thumbnails/3.jpg)
Refraction• Bending of waves when it
passes from one medium to another
• Waves bend because their speeds change when they move from one medium to another
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• Water waves change speed when they move from deep to shallow part
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• Transverse waves on a rope slow down as they move from thinner rope to thicker rope
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Refraction
• Objects look bent because light is refracted as it moves from air to water
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Remember• Sound moves fastest in solids, then liquids, then
gases and no sound at all in vacuum• But light moves fastest in vacuum, then gases,
then liquids, then solids
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Inquiry 2• Let’s do the glass bar, pins and paper
experiment.• Normal line• Incident angle• Refracted angle
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Remember• If light slows down from one medium to
another, the light ray is bent closer to the normal.– The angle of incidence is greater than the
angle of refraction– Example: air to glass, air to water
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Remember• If light speeds up from one medium to
another, the light ray is bent away from the normal.– The angle of incidence is smaller than the
angle of refraction– Example: glass to air, water to air
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• What and how you see things around you are different from what the fish sees.
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A fisheye’s view of the world
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A fisheye’s view of the world
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Remember• If light enters in a parallel-sided block,
then it leaves the block at the same angle as it enters the block but bent sideways.
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Inquiry 3• Put a coin in an empty beaker.• Move in such a way that you don’t see the
coin in the beaker anymore.• Ask your friend to slowly pour water in the
beaker.• What happens?
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Refraction• Causes things to look shallower than they
actually are• Apparent depth• Put a ruler in the beaker of water and read from
the top. Does it look longer or shorter?• What happens to the distance between
divisions on the ruler? – Are they closer or farther?
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Refraction• Measure the depth of the water from the
top.• Measure it again by putting the ruler on
the side of the beaker.• Are they the same or not?
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Going Beyond• What are everyday examples of refraction?
• What is a prism and why does it form rainbows?
• How is a rainbow formed?
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Prism• A transparent optical element with flat
polished surfaces that refract light. • Can be used to break light up to its
spectral colors– Colors of the rainbow
• Can also be used to reflect light
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Prism• Materials refract different wavelengths of
light at different angles• Dispersion• ROY G BIV
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Rainbow
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Rainbow
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Rainbow
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In transparent materials, some light are reflected
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Total Internal Reflection (TIR)When a ray does not cross the
boundary but is reflected instead
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Critical AngleAngle at which total internal
reflection occurs
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Fibre Optics
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Endoscope