light detailed work v1
TRANSCRIPT
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LIGHT AND COLOUR
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http://micro.magnet.fsu.edu/primer/java/reflection/index.html
LINK TO INTERACTIVE SITE – CLICK HERE
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Angle of incidence = angle of reflection
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THE LAW OF REFLECTION
• The angle of incidence is equal to the angle of reflection.
• The image in a plane mirror is virtual and is the same size as the object.
• Plane mirrors are used in periscopes.
• They are used in rear view mirrors.
• The image is as far behind the mirror is as the object is in front.
• Image is laterally inverted
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PERISCOPES
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Shiny smooth surfaces reflect regularly, other surfaces also reflect light but if the surface is rough the light is reflected in all directions. We call this diffuse reflection.
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Diffuse Reflection
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CONVEX AND CONCAVE MIRRORS
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http://micro.magnet.fsu.edu/primer/java/mirrors/concave.html
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Convex and Concave Mirrors
•A concave mirror is a converging mirror. Parallel rays of light are reflected through the focal point of a concave mirror.•A convex mirror is a diverging mirror. Parallel rays of light are reflected so that they appear to come from the focal point of a convex mirror.
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Molecular Expressions Microscopy Primer: Light and Color - Concave Mirrors: Interactive Java Tutorialhttp://micro.magnet.fsu.edu/primer/java/mirrors/convex.html
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Uses of Concave Mirrors• Used to collect light energy,
sound, heat, radiation, radar and TV signals.
• If you move close to a concave mirror, then you see a magnified image of yourself. This image is upright and virtual as well as magnified. Shaving and make up mirrors
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Uses of Convex Mirrors• They always produce virtual
upright images. • The image is always smaller than
the object.• They are useful when you want a
wide field of view – car driving mirrors or shop security.
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• This is the bending of light rays• Happens because the rays change
speed.• When they enter a more dense
medium (glass, water,) they slow down.
• When they enter a less dense medium – like air, they speed up.
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http://micro.magnet.fsu.edu/primer/java/refraction/index.html
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http://micro.magnet.fsu.edu/primer/java/variablelens/index.html
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Total internal reflectionand refraction
• When an object is viewed through water the image we see is changed because of the way light waves behave as they pass from the water into the air.
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CLICK HERE FOR INTERACTIVE SITE http://micro.magnet.fsu.edu/primer/java/refraction/fishtank/index.html
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White light is made up of the seven colours of the rainbow.
Red, orange, yellow, green, blue, indigo, and violet.
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Molecular Expressions Microscopy Primer: Light and Color - Refraction of Light
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Molecular Expressions Microscopy Primer: - Light and Color - Additive Primary Colors
Molecular Expressions Microscopy Primer: Light and Color - Subtractive Colors
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How We See Colour
• We see colours because those are refelected off and object. Yellow light is refelected to our eyes but the other colours are absorbed so we see yellow.
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RAINBOWS• We see rainbows because
the light is first refracted by the raindrop and then reflected off the back of the raindrop.
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MIXING COLOURS• When we mix the three primary
colours of light we get white light. RED GREEN BLUE
• If we mix the three secondary colours of light we get black CYAN MAGENTA YELLOW
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Molecular Expressions Microscopy Primer: Light and Color - Color Filters: Interactive Java Tutorial
In white light in red light in green light in blue light this is what the grapes and card will look like
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In these glasses only light perpendicular to the highway is allowed through. This halves the amount of light reachingthe eye.
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THE EYE
• The pupil allows light to enter the eye.• The lens helps to focus the light• Light sensitive cells in the retina detect the
light.• A nerve impulse travels from the retina to
the brain along the optic nerve where it is interpreted.
• The iris helps to change the size of the pupil
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Molecular Expressions Microscopy Primer: Light and Color - Human Vision: Interactive Java Tutorial
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http://cse.ssl.berkeley.edu/light/program.html
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CLICK HERE TO INVESTIGATE REFRACTION IN A PRISM http://micro.magnet.fsu.edu/primer/java/prismsandbeamsplitters/equilateralprism/index.html